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非动力型旋流特性 被引量:3
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作者 邱月辉 阎庆绂 《太原理工大学学报》 CAS 北大核心 2006年第1期51-54,共4页
以管内设置导流片产生的非动力型圆管旋流模型试验为基础,论述了非动力型圆管旋流产生的方法和原因;分析了随时间和位置不断变化旋流的涡量沿径向和轴向的变化规律和相对强度的变化规律,并从中总结出了影响圆管旋流特性及其变化的因素,... 以管内设置导流片产生的非动力型圆管旋流模型试验为基础,论述了非动力型圆管旋流产生的方法和原因;分析了随时间和位置不断变化旋流的涡量沿径向和轴向的变化规律和相对强度的变化规律,并从中总结出了影响圆管旋流特性及其变化的因素,得出了非动力型圆管旋流是一种由强制涡与势涡组合而成的复合涡,即为流体力学中所称的涡流。 展开更多
关键词 非动力型 圆管旋流 特性
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PPH术联合消痔灵注射在非动力型出口梗阻型便秘治疗中的临床效果观察 被引量:1
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作者 杜永亮 李韩 《中国实用医药》 2023年第24期41-45,共5页
目的探讨吻合器痔上黏膜环切术(PPH术)配合消痔灵注射对非动力型出口梗阻型便秘(OOC)患者治疗中的临床疗效。方法208例非动力型出口梗阻型便秘患者,按照治疗方式不同分为对照组和观察组,每组104例。对照组行PPH术进行治疗,观察组在对照... 目的探讨吻合器痔上黏膜环切术(PPH术)配合消痔灵注射对非动力型出口梗阻型便秘(OOC)患者治疗中的临床疗效。方法208例非动力型出口梗阻型便秘患者,按照治疗方式不同分为对照组和观察组,每组104例。对照组行PPH术进行治疗,观察组在对照组的基础上加用消痔灵注射。比较两组患者的临床疗效、围术期指标、便秘症状严重程度(Wexner评分)、生活质量和并发症发生率。结果观察组临床总有效率为92.31%,显著高于对照组的81.73%,差异具有统计学意义(P<0.05)。两组手术时间、术中出血量、术后24 h疼痛评分、术后首次排便时间比较差异无统计学意义(P>0.05)。术后1、3、6个月,观察组Wexner评分分别为(5.25±1.53)、(6.52±2.86)、(7.41±1.60)分,显著低于对照组的(6.17±2.98)、(8.12±3.87)、(9.12±3.45)分,差异具有统计学意义(P<0.05)。观察组便秘患者生活质量量表(PAC-QOL)中身体不适、心理不适、担心与焦虑、满意度评分及总分分别为(5.12±3.45)、(7.54±6.14)、(15.26±8.19)、(9.70±4.41)、(37.62±10.44)分,均显著低于对照组的(7.26±3.19)、(9.48±5.18)、(19.15±9.41)、(12.18±4.51)、(48.07±10.22)分,差异具有统计学意义(P<0.05)。观察组并发症发生率为7.69%,显著低于对照组的21.15%,差异具有统计学意义(P<0.05)。结论采用PPH术配合消痔灵注射治疗非动力型出口梗阻型便秘临床效果显著,能够有效改善便秘,提升生活质量,降低并发症发生率,值得临床推广应用。 展开更多
关键词 吻合器痔上黏膜环切术 消痔灵注射 非动力型出口梗阻便秘 临床疗效
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低排放混合动力驱动车
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作者 沈培康 《科学》 1999年第4期51-53,共3页
开发新能源和减少环境污染,这两方面的工作越来越引起世界各国的重视。据统计,世界上20%~25%的能源用于路面交通运输。传统车辆使用的能源主要为汽油、柴油。这些物质燃烧后会严重污染环境,其排放物主要为 NO_x、SO_x、CO、CO_2和活性... 开发新能源和减少环境污染,这两方面的工作越来越引起世界各国的重视。据统计,世界上20%~25%的能源用于路面交通运输。传统车辆使用的能源主要为汽油、柴油。这些物质燃烧后会严重污染环境,其排放物主要为 NO_x、SO_x、CO、CO_2和活性有机气体。在城市内行驶的车辆是造成城市空气污染的主要原因。空气污染引起的危害是不可忽视的。据调查,维持城市交通秩序的人员,由于长期呼吸受污染的空气,其寿命明显短于普通人。 展开更多
关键词 电动车辆 混合动力驱动车 开发 燃烧动力
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Hydrogen desorption kinetics mechanism of Mg-Ni hydride under isothermal and non-isothermal conditions 被引量:2
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作者 陈朝轶 陈辉林 +1 位作者 马亚芹 刘静 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第1期160-166,共7页
The Mg-Ni hydride was prepared by hydriding combustion synthesis under a high magnetic field. The dehydriding kinetics of the hydrides was measured under the isothermal and non-isothermal conditions. A model was appli... The Mg-Ni hydride was prepared by hydriding combustion synthesis under a high magnetic field. The dehydriding kinetics of the hydrides was measured under the isothermal and non-isothermal conditions. A model was applied to analyzing the kinetics behavior of Mg-Ni hydride. The calculation results show that the theoretical value and the experimental data can reach a good agreement, especially in the case of non-isothermal dehydriding. The rate-controlling step is the diffusion of hydrogen atoms in the solid solution. The sample prepared under magnetic field of 6 T under the isothermal condition can reach the best performance. The similar tendency was observed under the non-isothermal condition and the reason was discussed. 展开更多
关键词 Mg-Ni hydride hydrogen desorption kinetics model isothermal condition non-isothermal condition
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Nonlinear dynamic analysis of interaction between vehicle and road surfaces for 5-axle heavy truck 被引量:1
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作者 黎文琼 张建润 +1 位作者 刘晓波 王园 《Journal of Southeast University(English Edition)》 EI CAS 2011年第4期405-409,共5页
Based on the analysis of nonlinear geometric characteristics of the suspension systems and tires, a 3D nonlinear dynamic model of a typical heavy truck is established. The impact factors of dynamic tire loads, includi... Based on the analysis of nonlinear geometric characteristics of the suspension systems and tires, a 3D nonlinear dynamic model of a typical heavy truck is established. The impact factors of dynamic tire loads, including the dynamic load stress factors, and the maximal and the minimal vertical dynamic load factors, are used to evaluate the dynamic interaction between heavy vehicles and roads under the condition of random road surface roughness. Matlab/Simulink is used to simulate the nonlinear dynamic system and calculate the impact factors. The effects of different road surface conditions on the safety of vehicle movement and the durability of parts of a vehicle are analyzed, as well as the effects of different structural parameters and different vehicle speeds on road surfaces. The study results provide both the warning limits of road surface roughness and the limits of corresponding dynamic parameters for the 5-axle heavy truck. 展开更多
关键词 5-axle heavy truck nonlinear dynamics dynamic impact factor road surlhce roughness
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Low-speed instability analysis for hydraulic motor based on nonlinear dynamics 被引量:4
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作者 LIN Rong-chuan WEI Sha-sha YUAN Xiao-ling 《Journal of Coal Science & Engineering(China)》 2010年第3期328-332,共5页
A nonlinear dynamics model and a mathematical expression were set up to investigatethe mechanism and conditions of vibration creep acceleration.The model showsthat hydraulic spring and nonlinear friction are major fac... A nonlinear dynamics model and a mathematical expression were set up to investigatethe mechanism and conditions of vibration creep acceleration.The model showsthat hydraulic spring and nonlinear friction are major factors that can affect low-speed instability.The mathematic model was established to obtain the change rule of speed andinstantaneous acceleration of the hydraulic motor.Then, Matlab was used to simulate theeffect of nonlinear friction force and hydraulic motor parameters such as coefficient of leakand compression ratio, etc., under low speed.Finally, some measures were proposed toimprove the low-speed stability of the hydraulic motor. 展开更多
关键词 hydraulic motor nonlinear dynamics hydraulic spring vibration creep accel- eration computer simulation
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Multi-domain modeling and simulation of proportional solenoid valve 被引量:3
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作者 刘艳芳 戴振坤 +1 位作者 徐向阳 田亮 《Journal of Central South University》 SCIE EI CAS 2011年第5期1589-1594,共6页
A multi-domain nonlinear dynamic model of a proportional solenoid valve was presented.The electro-magnetic,mechanical and fluid subsystems of the valve were investigated,including their interactions.Governing equation... A multi-domain nonlinear dynamic model of a proportional solenoid valve was presented.The electro-magnetic,mechanical and fluid subsystems of the valve were investigated,including their interactions.Governing equations of the valve were derived in the form of nonlinear state equations.By comparing the simulated and measured data,the simulation model is validated with a deviation less than 15%,which can be used for the structural design and control algorithm optimization of proportional solenoid valves. 展开更多
关键词 fluid mechanics proportional solenoid valve dynamic characteristic multi-domain modeling SIMULATION
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Approximate Solution for Mechanism of Thermally and Wind-driven Ocean Circulation 被引量:4
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作者 MO Jiaqi LIN Wantao LIN Yihua 《Chinese Geographical Science》 SCIE CSCD 2010年第5期383-388,共6页
The thermally and wind-driven ocean circulation is a complicated natural phenomenon in the atmospheric physics. Hence we need to reduce it using basic models and solve the models using approximate methods. A non-linea... The thermally and wind-driven ocean circulation is a complicated natural phenomenon in the atmospheric physics. Hence we need to reduce it using basic models and solve the models using approximate methods. A non-linear model of the thermally and wind-driven ocean circulation is used in this paper. The results show that the zero solution of the linear equation is a stable focus point, which is the path curve trend origin point as time (t) trend to infinity. By using the homotopic mapping perturbation method, the exact solution of the model is obtained. The homotopic mapping perturbation method is an analytic solving method, so the obtained solution can be used for analytic operating sequentially. And then we can also obtain the diversified qualitative and quantitative behaviors for corresponding physical quantities. 展开更多
关键词 global climate atmosphere-ocean oscillation homotopic mapping approximate solution
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Information Entropy Squeezing for a Atom in Mode-Mode Competition System 被引量:2
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作者 WU Qin FANG Mao-Fa +2 位作者 LI Shao-Xin LI Ying HU Yao-Hua 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第12期1411-1416,共6页
The entropy squeezing properties for a two-level atom interacting with a two-mode field via two differentcompeting transitions are investigated from a quantum information point of view.The influences of the initial st... The entropy squeezing properties for a two-level atom interacting with a two-mode field via two differentcompeting transitions are investigated from a quantum information point of view.The influences of the initial state of thesystem and the relative coupling strength between the atom and the field on the atomic information entropy squeezingare discussed.Our results show that the squeezed direction and the frequency of the information entropy squeezing canbe controlled by choosing the phase of the atom dipole and the relative competing strength of atom-field,respectively.We find that,under the same condition,no atomic variance squeezing is predicted from the HUR while optimal entropysqueezing is obtained from the EUR,so the quantum information entropy is a remarkable precision measure for theatomic squeezing in the considered system. 展开更多
关键词 mode-mode competition model information entropy squeezing variance squeezing information entropy uncertainty relation
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Micro-vibration response analysis and its application of electronic workshop raw land based on whale optimization algorithm 被引量:1
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作者 YU Caizhi LU Yutai +1 位作者 WANG Peng SUN Changku 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2022年第4期390-397,共8页
Environmental micro-vibration is one of the key factors impacting the running of electronic workshop.Low frequency micro-vibration has a significant influence on the normal operation of high precision machining and te... Environmental micro-vibration is one of the key factors impacting the running of electronic workshop.Low frequency micro-vibration has a significant influence on the normal operation of high precision machining and testing equipment,and even causes irreversible damage to the equipment.Micro-vibration testing and response analysis are important to guide the vibration isolation design and ensure the stable operation of various precision equipment in the workshop.Parameters of Davidenkov model are fitted based on whale swarm optimization algorithm,and its applicability is verified.At the same time,taking the testing project of an electronic workshop raw land as an example,the micro-vibration response is analyzed.The results show that the nonlinear constitutive model constructed by whale optimization algorithm can simulate the dynamic nonlinear behavior of soil under the action of micro-vibration better.Compared with the traditional equivalent linearization method,the nonlinear constitutive model based on the whale optimization algorithm has a smaller acceleration response value.It can effectively suppress the“virtual resonance effect”produced by the equivalent linearization method. 展开更多
关键词 micro-vibration response nonlinear dynamic constitutive model whale optimization algorithm electronic workshop raw land
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Support vector machine based nonlinear model multi-step-ahead optimizing predictive control 被引量:9
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作者 钟伟民 皮道映 孙优贤 《Journal of Central South University of Technology》 EI 2005年第5期591-595,共5页
A support vector machine with guadratic polynomial kernel function based nonlinear model multi-step-ahead optimizing predictive controller was presented. A support vector machine based predictive model was established... A support vector machine with guadratic polynomial kernel function based nonlinear model multi-step-ahead optimizing predictive controller was presented. A support vector machine based predictive model was established by black-box identification. And a quadratic objective function with receding horizon was selected to obtain the controller output. By solving a nonlinear optimization problem with equality constraint of model output and boundary constraint of controller output using Nelder-Mead simplex direct search method, a sub-optimal control law was achieved in feature space. The effect of the controller was demonstrated on a recognized benchmark problem and a continuous-stirred tank reactor. The simulation results show that the multi-step-ahead predictive controller can be well applied to nonlinear system, with better performance in following reference trajectory and disturbance-rejection. 展开更多
关键词 nonlinear model predictive control support vector machine nonlinear system identification kernel function nonlinear optimization
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Kinetic Model and Simulation of Promoted Selective Non-catalytic Reduction by Sodium Carbonate 被引量:32
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作者 韩奎华 路春美 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2007年第4期512-519,共8页
Abstract The detailed kinetic model of selective non-catalytic reduction (SNCR) of nitric oxide, including so-dium species reactions, was deyeloped on the basis of recent studies on thermal DeNOx mechanism, NOxOUTme... Abstract The detailed kinetic model of selective non-catalytic reduction (SNCR) of nitric oxide, including so-dium species reactions, was deyeloped on the basis of recent studies on thermal DeNOx mechanism, NOxOUTmechanism and promotion mechanism of Na2CO3. The model was validated by comparison with several experi-mental findings, thus providing an effective tool for the primary and promoted SNCR process simulation. Experimental and simulated results show part-per-million level of sodium carbonate enhances NO removal efficiency andextend the effective SNCR temperature range in comparison with use of a nitrogen agent alone. The kinetic modeling, sensitivity and rate-of-production analysis suggest that the performance improvement can be explained as ho-mogeneous sodium species reactions producing more reactive OH radicals. The net result of sodium species reac-tions is conversion of H2O and inactive HO2 radicals into reactive OH radicals, i.e. H2O+HO2=3OH, which enhances the SNCR performance of nitrogen agents by mainly increasing the production rate of NH2 radicals. More-over, N2O and CO are eliminated diversely via the reactions Na+N20=NaO+N2, NaO+CO=Na+CO2 andNaO2+CO =NaO+CO2, in.the pro.moted SNCR process, especially in the NOxOUT process. 展开更多
关键词 kinetic naodel SIMULATION selective non-catalytic reduction nitfic oxide sodium carbonate MECHANISM
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COMPLEXITY AND CHAOTIC DYNAMICS OF ROCK FAULTING 被引量:1
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作者 TANKaixuan XIEYanshi +1 位作者 CHENGuanghao HUANGXiaonai 《Geotectonica et Metallogenia》 2003年第1期104-111,共8页
Fault is a complex dynamic system controlled by the coupling of rock texture, reaction, fluid flow,stress, and rock deformation mechanism. A coupled reaction-transport- mechanical dynamic model for fault system is est... Fault is a complex dynamic system controlled by the coupling of rock texture, reaction, fluid flow,stress, and rock deformation mechanism. A coupled reaction-transport- mechanical dynamic model for fault system is established and described in this paper. An example is presented for the Shuikoushan deposit, Hunan. The results of dynamic simulation indicate that the evolution and magnitude of fracture permeability of different rocks are different, and that faulting can enhance the spatial heterogeneity of rock permeability and facilitate fluid flow and mineralization in local fault zone. The pressure for a fault usually shows a variation mode of aperiodic oscillation with time, which reflects the chaotic behavior of the evolution of a fault. 展开更多
关键词 reaction-transport-mechanical coupling COMPLEXITY chaotic evolution rock faulting
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Analysis of nonlinear dynamic character in the surrounding rock system for deep buried underground engineering 被引量:4
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作者 ZHAO Yu PENG Hal-you 《Journal of Coal Science & Engineering(China)》 2010年第4期362-366,共5页
Combining the field monitoring results of a deep-buried tunnel in Chongqing,the dynamic characteristics of the surrounding rock system under high in situ stress wasanalyzed by phase space reconstruction, calculating c... Combining the field monitoring results of a deep-buried tunnel in Chongqing,the dynamic characteristics of the surrounding rock system under high in situ stress wasanalyzed by phase space reconstruction, calculating correlation dimension, Kolmogoroventropy and largest Lyapunov exponents.Both the Kolmogorov entropy and largestLyapunov exponents show that the surrounding rock system is a chaotic one.Based onthis, a local model was applied to predict surrounding rock displacement, and a nonlineardynamic model was derived to forecast the interaction of the surrounding rock and supportstructure.The local method was found to have an extremely small total error.Also, thenonlinear dynamic model forecasting curves agree with the monitoring ones very well.It isproved that the nonlinear dynamic characteristic study is very important in analyzing rockstability and predicting the evolution of rock systems. 展开更多
关键词 nonlinear dynamics ROCK deep-buried underground engineering
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Kinetic Modeling of Isothermal or Non-isothermal Adsorption in a Pellet:Application to Adsorption Heat Pumps 被引量:1
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作者 Ludovic Montastruc Pascal Floquet +2 位作者 Volker Mayer Iordan Nikov Serge Domenech 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第4期544-553,共10页
Understanding the interaction between a fluid and a solid phase is of fundamental importance to the design of an adsorption process.Because the heat effects associated with adsorption are comparatively large,the as-su... Understanding the interaction between a fluid and a solid phase is of fundamental importance to the design of an adsorption process.Because the heat effects associated with adsorption are comparatively large,the as-sumption of isothermal behavior is a valid approximation only when uptake rates are relatively slow.In this article,we propose to determine when it is needed to choose the isothermal or non-isothermal assumption according to two physical parametersα(ratio convection/capacity) andβ(quantity of energy/capacity) .The proposed problem is solved by a mathematical method in the Laplace domain.Whenα→∞(infinitely high heat transfer coefficient) or β→0(infinitely large heat capacity) ,the limiting case is isothermal.When the diffusion is rapid(α10) the kinetics of sorption is controlled entirely by heat transfer.If the adsorption process is to be used as a heat pump,it shall be represented by an isotherm model withαandβas high as possible. 展开更多
关键词 ADSORPTION NON-ISOTHERMAL ENERGY PELLET
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Exact Solutions of Nonlinear Dynamics Equation in a New Double—Chain Model of DNA 被引量:1
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作者 QIANXian-Min LOUSen-Yue 《Communications in Theoretical Physics》 SCIE CAS CSCD 2003年第4期501-505,共5页
The exact solutions of the general nonlinear dynamic system in a new double-chain model of DNA are studied by using both the Conte's Painlevé truncation expansion and the Pickering's truncation expansion.... The exact solutions of the general nonlinear dynamic system in a new double-chain model of DNA are studied by using both the Conte's Painlevé truncation expansion and the Pickering's truncation expansion. The symmetric kink-kink shape excitations can be found in both the Conte's truncation expansion and the Pickering's truncation expansion. Three types of new localized excitations, the asymmetric kink-kink excitations, the soliton-kink excitation, and the kink-soliton excitations, are found by using the Pickering's nonstandard truncation expansion. 展开更多
关键词 double chain-model of DNA truncation expansion exact solution
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Investigation of non-isothermal and isothermal gasification process of coal char using different kinetic model 被引量:6
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作者 Wang Guangwei Zhang Jianliang +2 位作者 Shao Jiugang Li Kejiang Zuo Haibin 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第1期15-21,共7页
Isothermal and non-isothermal gasification kinetics of coal char were investigated by using thermogravimetric analysis(TGA) in CO2 atmosphere, and the experimental data were interpreted with the aids of random pore mo... Isothermal and non-isothermal gasification kinetics of coal char were investigated by using thermogravimetric analysis(TGA) in CO2 atmosphere, and the experimental data were interpreted with the aids of random pore model(RPM), unreacted shrinking core model(URCM) and volume model(VM). With the increase of heating rate, gasification curve moves into high temperature zone and peak rate of gasification increases; with the increase of gasification temperature, gasification rate increases and the total time of gasification is shortened. The increase of both heating rate and gasification temperature could improve gasification process of coal char. Kinetics analysis indicates that experimental data agree better with the RPM than with the other two models. The apparent activation energy of non-isothermal and isothermal gasification of coal char using RPM is 193.9 k J/mol and 212.6 k J/mol respectively, which are in accordance with reported data. Gasification process of coal char under different heating rates and different temperatures are predicted by the RPM derived in this study, and it is found that the RPM predicts the reaction process satisfactorily. 展开更多
关键词 Coal charGasificationThermogravimetric analysisKinetics model
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Three-Dimensional Numerical Investigation of the Separation Process in a Vortex Tube at Different Operating Conditions 被引量:4
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作者 Seyed Ehsan Rafiee M.M. Sadeghiazad 《Journal of Marine Science and Application》 CSCD 2016年第2期157-165,共9页
Air separators provide safe, clean, and appropriate air flow to engines and are widely used in vehicles with large engines such as ships and submarines. In this operational study, the separation process in a Ranque-Hi... Air separators provide safe, clean, and appropriate air flow to engines and are widely used in vehicles with large engines such as ships and submarines. In this operational study, the separation process in a Ranque-Hilsch vortex tube cleaning (cooling) system is investigated to analyze the impact of the operating gas type on the vortex tube performance; the operating gases used are air, nitrogen, oxygen, carbon dioxide and nitrogen dioxide. The computational fluid dynamic model used is equipped with a three-dimensional structure, and the steady-state condition is applied during computations. The standard k-c turbulence model is employed to resolve nonlinear flow equations, and various key parameters, such as hot and cold exhaust thermal drops, and power separation rates, are described numerically. The results show that nitrogen dioxide creates the greatest separation power out of all gases tested, and the numerical results are validated by good agreement with available experimental data. In addition, a comparison is made between the use of two different boundary conditions, the pressure-far-field and the pressure-outlet, when analyzing complex turbulent flows in the air separators. Results present a comprehensive and practical solution for use in future numerical studies. 展开更多
关键词 vortex tube air separator separation process operatinggas numerical simulation
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Adaptive trajectory tracking control of two-wheeled self-balance robot 被引量:1
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作者 秦勇 《High Technology Letters》 EI CAS 2009年第1期38-43,共6页
Wheeled mobile robot is one of the well-known nonholonomic systems. A two-wheeled sell-balance robot is taken as the research objective. This paper carried out a detailed force analysis of the robot and established a ... Wheeled mobile robot is one of the well-known nonholonomic systems. A two-wheeled sell-balance robot is taken as the research objective. This paper carried out a detailed force analysis of the robot and established a non-linear dynamics model. An adaptive tracking controller for the kinematic model of a nonhotonomic mobile robot with unknown parameters is also proposed. Using control Lyapunov function (CLF), the controller's global asymptotic stability has been proven. The adaptive trajectory tracking controller decreases the disturbance in the course of tracking control and enhances the real-time control characteristics. The simulation result indicated that the wheeled mobile robot tracking can be effectively controlled. 展开更多
关键词 wheeled mobile robot adaptive control trajectory tracking asymptotic stability
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Numerical analysis on coal-breaking process under high pressure water jet 被引量:7
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作者 CHEN Jin-hua LIANG Yun-pei CHENG Guo-qiang 《Journal of Coal Science & Engineering(China)》 2009年第3期289-294,共6页
Based on the theory of nonlinear dynamic finite element,the control equation ofcoal and water jet was acquired in the coal breaking process under a water jet.The calculationmodel of coal breaking under a water jet was... Based on the theory of nonlinear dynamic finite element,the control equation ofcoal and water jet was acquired in the coal breaking process under a water jet.The calculationmodel of coal breaking under a water jet was established;the fluid-structure couplingof water jet and coal was implemented by penalty function and convection calculation.The dynamic process of coal breaking under a water jet was simulated and analyzed bycombining the united fracture criteria of the maximum tensile strain and the maximal shearstrain in the two cases of damage to coal and damage failure to coal. 展开更多
关键词 numerical analysis coal breaking high pressure water jet fluid-structure coupling DAMAGE DRILL
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