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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >IMPLEMENTATION OF A FINITE-ELEMENT BASED MESH MOTION TECHNIQUE IN AN OPEN SOURCE CFD CODE
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IMPLEMENTATION OF A FINITE-ELEMENT BASED MESH MOTION TECHNIQUE IN AN OPEN SOURCE CFD CODE

机译：开源CFD代码中基于有限元的网格运动技术的实现

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摘要

Nowadays, Computational Fluid Dynamic (CFD) codes are widely used in different industrial fields. Although hardware and numerical model improvements, the mesh generation remains one of the key points for a successful CFD simulation. Mesh quality is influenced by the adopted mesh generator tool and, after all, by the designer's experience and it becomes very important when moving meshes are required. In fact, mesh skewness, aspect ratio, and non-orthogonality have to be controlled during the deforming process since their wrong evolution could produce an unphysical behavior of the computed flow field.rnMesh motion could be performed by different strategies: dynamic smoothing operation and dynamic re-meshing operation, are, today, two of the mainly used approaches. All of them can be combined to guarantee the correct reproduction of motion profile and a good mesh quality level. In this context, the authors have implemented a moving mesh methodology in the Open Source CFD code OpenFOAM?. A multiple number of meshes is used to cover the whole simulation period, and the grid point motion is accommodated by an automatic mesh motion techinque with polyhedral cell support. The Laplace equation is chosen to govern mesh motion. This guarantees that an initial valid mesh remains valid for arbitrary boundary motion. Mesh to mesh interpolation is performed by using a cell based, distance weighted interpolation technique. The proposed approach was tested on a real IC-engine geometry. In particular, the mesh quality evolution during motion, the numerical results and the computational costs were evaluated.
机译：如今，计算流体动力学（CFD）代码已广泛用于不同的工业领域。尽管改进了硬件和数值模型，但网格生成仍然是成功进行CFD仿真的关键点之一。网格质量受采用的网格生成器工具影响，毕竟受设计者的经验影响，当需要移动网格时，网格质量变得非常重要。实际上，在变形过程中必须控制网格的偏斜度，长宽比和非正交性，因为它们的错误演化会产生计算流场的非物理行为。rnMesh运动可以通过不同的策略执行：动态平滑操作和动态如今，重新啮合操作是两种主要使用的方法。所有这些都可以结合使用，以确保正确再现运动轮廓和良好的网格质量。在这种情况下，作者已经在开源CFD代码OpenFOAM中实现了移动网格方法。使用多个网格覆盖整个模拟周期，并通过具有多面体单元支持的自动网格运动技术来适应网格点运动。选择拉普拉斯方程来控制网格运动。这保证了初始有效的网格对于任意边界运动仍然有效。网格到网格的插值是通过使用基于单元的距离加权插值技术来执行的。所提出的方法已在真实的IC引擎几何结构上进行了测试。特别是，评估了运动过程中的网格质量演变，数值结果和计算成本。

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