Computation of flow problems with the Mixed Interface-Tracking/Interface-Capturing Technique (MITICT)
Computation of flow problems with the Mixed Interface-Tracking/Interface-Capturing Technique (MITICT)
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DOI：
10.1016/j.compfluid.2005.07.008
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发表时间：
2007-01-01
影响因子：
2.8
通讯作者：
Ungor, Mehmet
中科院分区：
文献类型：
--
作者：
Akin, J. Ed;Tezduyar, Tayfun E.;Ungor, Mehmet
在流固界面流动问题的计算中，采用一种界面跟踪技术，使流体网格移动以跟踪界面，从而使我们能够完全控制边界层中流体网格的分辨率。另一方面，使用界面捕获技术（或更一般情况下的界面定位技术），与界面几何形状的表示精度无关，边界层中流体网格的分辨率将受到界面上流体网格分辨率的限制。在计算具有流体-流体界面的流动问题时，如果界面过于复杂或不稳定而无法在控制网格重划分频率的情况下进行跟踪，则可以根据需要使用增强离散化的界面捕获技术作为更灵活的选择。有时我们可能需要同时解决流固界面和复杂或非定常流固界面的流动问题。引入了混合接口跟踪/接口捕获技术（MITICT），用于计算既可以用移动网格方法精确跟踪的接口，也可以使用接口捕获技术来跟踪过于复杂或不稳定的接口。作为接口跟踪技术，我们使用了Defonning-Spatial-Domain/ stabilize Space - Time （DSD/SST）公式。界面捕捉技术基于此，并基于对移动网格的求解，除了Navier-Stokes方程之外，还有控制界面函数时间演化的平流方程。对于本文报告的计算，作为接口捕获技术，我们使用了边缘跟踪接口定位技术（ETILT）的一个版本。(c) 2005 Elsevier Ltd版权所有。
In computation of flow problems with fluid-solid interfaces, an interface-tracking technique, where the fluid mesh moves to track the interface, would allow us to have full control of the resolution of the fluid mesh in the boundary layers. With an interface-capturing technique (or an interface locator technique in the more general case), on the other hand, independent of how accurately the interface geometry is represented, the resolution of the fluid mesh in the boundary layer will be limited by the resolution of the fluid mesh at the interface. In computation of flow problems with fluid-fluid interfaces where the interface is too complex or unsteady to track while keeping the remeshing frequency under control, interface-capturing techniques, with enhanced-discretization as needed, could be used as more flexible alternatives. Sometimes we may need to solve flow problems with both fluid-solid interfaces and complex or unsteady fluid-fluid interfaces. The Mixed Interface-Tracking/Interface-Capturing-Technique (MITICT) was introduced for computation of flow problems that involve both interfaces that can be accurately tracked with a moving mesh method and interfaces that are too complex or unsteady to be tracked and therefore require an interface-capturing technique. As the interface-tracking technique, We use the Defonning-Spatial-Domain/Stabilized Space Time (DSD/SST) formulation. The interface-capturing technique rides on this, and is based on solving over a moving mesh, in addition to the Navier-Stokes equations, the advection equation governing the time-evolution of the interface function. For the computations reported in this paper, as interface-capturing technique we are using one of the versions of the Edge-Tracked Interface Locator Technique (ETILT). (c) 2005 Elsevier Ltd. All rights reserved.