论文标题
有效的显式跳跃HOC沉浸式接口方法,用于瞬态不可压缩的粘性流动
An efficient explicit jump HOC immersed interface approach for transient incompressible viscous flows
论文作者
论文摘要
在目前的工作中,我们提出了一种新型的混合显式跳跃接口方法,并结合了一个高阶紧凑型(HOC)方案,用于模拟由流函数 - 涡旋($ψ$ - $ζ$)的瞬态复合流动($ navier-stokes(n-s)方程式(navier-s)方程式),以进行不可压缩的粘贴效果。使用拉格朗日插值在笛卡尔网格上使用拉格朗日插值,已经采用了一种新的策略,用于在界面穿越界面的不规则点的跳跃条件。这种方法是从解决方案,源项和界面上的系数中的不连续性的抛物线方程开始,可以很容易地容纳到融入流中的虚张声势的模拟流中。与其他现有方法相比,误差的幅度和更快的衰减反映了该方法的优势。人们可以非常有效地处理在现实世界中具有实际影响的几个流体流问题,这涉及涉及多个和移动身体的流动。这包括经过固定的圆形和二十四个边缘仙人掌缸的流,流过两个串联圆柱体,在某种情况下,在某种情况下,在另一种情况下,其中一个是在时间上以变化的时间横向移动。据我们所知,最后两个示例首次通过采用$ψ$ - $ζ$配方进行有限差设置的方法来解决。我们计算的解决方案与现有的数值和实验结果的极端紧密相结合,体现了所提出方法的准确性和鲁棒性。
In the present work, we propose a novel hybrid explicit jump immersed interface approach in conjunction with a higher order compact (HOC) scheme for simulating transient complex flows governed by the streamfunction-vorticity ($ψ$-$ζ$) formulation of the Navier-Stokes (N-S) equations for incompressible viscous flows. A new strategy has been adopted for the jump conditions at the irregular points across the interface using Lagrangian interpolation on a Cartesian grid. This approach, which starts with the discretization of parabolic equations with discontinuities in the solutions, source terms and the coefficients across the interface, can easily be accommodated into simulating flow past bluff bodies immersed in the flow. The superiority of the approach is reflected by the reduced magnitude and faster decay of the errors in comparison to other existing methods. It is seen to handle several fluid flow problems having practical implications in the real world very efficiently, which involves flows involving multiple and moving bodies. This includes the flow past a stationary circular and a twenty-four edge cactus cylinder, flows past two tandem cylinders, where in one situation both are fixed and in another, one of them is oscillating transversely with variable amplitude in time. To the best of our knowledge, the last two examples have been tackled for the first time by such an approach employing the $ψ$-$ζ$ formulation in finite difference set-up. The extreme closeness of our computed solutions with the existing numerical and experimental results exemplifies the accuracy and the robustness of the proposed approach.