摘要
当物体加速运动时,会带动周围流体一起运动,此时产生的流体惯性力可由附加质量来表示。目前计算复杂外形物体的附加质量方法并不多,且存在精度不高和计算复杂等问题。文中运用Fluent商用计算软件得到了数值计算复杂外形物体附加质量的新方法。此方法是利用Fluent无粘流模型以及动网格技术,数值模拟物体的匀变速运动,并得到其所受的合力,然后根据其受力方程得到物体六自由度运动情况下的附加质量。通过与其它计算附加质量的方法进行比较,证明了此方法具有较高精度和使用方便等特点。文中还运用此方法计算了带尾翼LOTTE飞艇的附加质量,用以在数值分析其运动时使用。
When the object accelerates, it will make fluid move and produce inertial force which can be expressed by added mass. At present, the methods for computing the added mass of complicated objects are not too much and are not precise or too complicated. A new numerical method for obtaining added masses of the complicated object is developed by using the Fluent commercial computational Codes in this paper. The method uses the inviscid model and the Dynamic - mesh technique in Fluent. Then the accelerated motion of the object can be simulated, and we can use the force equation to compute the object＇s added mass of six degrees of freedom by the forces obtained from Flunet. By comparing the results with those given from other methods, the high precision and efficiency of the method are verified. The added mass of the airship LOTTE is also computed for its numerical moving analysis.
出处
《计算机仿真》
CSCD
2007年第5期75-78,113,共5页
Computer Simulation
基金
交大空天科技创新项目培育基金(JKJ-200604)
关键词
附加质量
非定常
动网格
商用计算软件
Added mass
Unsteady flow
Dynamic - mesh
Commercial computational codes
