DARPA2潜艇模型非定常流动粘性流场和水动力计算

Unsteady viscous flow and hydrodynamic force's numerical methodology of DARPA2 submarine model

采用基于非结构化网格的有限体积法数值求解非定常的DARPA2潜艇模型粘性流场和水动力,应用动网格技术处理含有动态边界问题的非稳态运动状态,通过调整边界条件和部分松弛因子,使初始流场变量达到收敛精度,并采用编译的UDF对模型运动进行定义。为了得到较好的非定常结果,需要对初始流场进行讨论。用model-1对实验数据的拟合效果较好,数值计算结果稳定。要取得与实验一致的模拟效果,由实验中的不确定因素产生的误差是需要加以考虑的进行非定常数值模拟。

A calculating method of finite volume method which is based on unstructured meshes is proposed to simulate the unsteady flow and hydrodynamic force of DARPA2 submarine model,and the dynamic grid technique is adopted to solve the unsteady state with dynamic boundary problem.The initial variables of flow is convergent by changing the boundary conditions and part of relaxing factor.Also,the motion of submarine model is defined by UDF model,which is compiled in this paper.Initial flow is discussed with the purpose of getting the accurate unsteady results.In model-1,the imitative effect is preferable and the calculation is stable.The uncertain factor in the experiment,including equipment and the physics character of the flow variable,should be considered with a view to obtain an appropriate imitative effect.