建筑风压场数值模拟中压力波动的平抑

在以同位网格为基础的简单流场压力计算中,通常采用动量插值方法来平抑流场中的压力波动现象;但是对于建筑风场等复杂的钝体绕流问题,由该平抑方法得到的收敛风压场仍可能存在小幅波动。为彻底解决同位网格格式下的压力波动,除采用动量插值方法外,本文提出了在压力校正方程的界面流速中添加压力梯度差值项的方法。算例分析表明,该方法计算得到的建筑风压场完全避免了压力波动现象,风压解与试验结果吻合良好。

Elimination of pressure wiggles in numerical simulation of wind pressure around buildings

When the nonstaggered grid was applied to the calculation of ordinary flow,the momentum interpolation method could eliminate the possible pressure wiggles.But in the calculation of complicated flow around the bluff body,such as the wind flow around buildings,the possible small wiggles still appeared on the convergent pressure field when the above method was adopted alone.In order to eliminate the small wiggles when nonstaggered grid was used,except for the use of the momentum interpolation method,a new method was proposed and applied at the same time.In the new method,a pressure-gradient difference term was added to the flow velocity in each control-volume interface when dealing with the mass source in pressure-correction equation.Through the evaluation and analysis,it reveals that this method overcomes the problem of pressure wiggles in the numerical simulation of wind pressure around buildings completely,and the calculational results agree with the test results.