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You should be familiar with the dynamic mesh model. Some of the basic steps in the setup and solution procedures will not be shown explicitly.

Prerequisites This tutorial assumes that you are familiar with the FLUENT interface and have a good understanding of the basic set up and solution procedures. Preview the dynamic mesh before starting the flow computation.

Use the three DM-specific macros in a UDF to control the dynamic mesh. In this tutorial you will learn how to: Set up the dynamic mesh (DM) model for this problem. The rotation of the blade, the oscillation of the membrane, and the sliding of the nodes along the top wall of the housing are defined and controlled by means of a UDF that utilizes the three macros specific to the dynamic mesh model. The motion of the rotating blade and the oscillating membrane have a large amplitude which requires the use of local remeshing. To learn about all of the new enhancements in Fluent’s mesh adaption model, request the on-demand webinar, Ansys 2021 R2: Ansys Fluent Mesh Adaption Update.1 Tutorial: Using a UDF to Control the Dynamic Mesh of a Flexible Oscillating Membrane Introduction The purpose of this tutorial is to illustrate how to use a user defined function (UDF) to control the dynamic mesh of a generic flow device with a rotating blade and a flexible oscillating membrane. This method enables us to not track the interface of smaller drops and reduces the need to have very fine meshes.Ī second important piece of this hybrid model is the dynamic mesh refinement and coarsening. Interface areas are tracked with fine mesh and once a blob is identified for transfer to the DPM model, the local mesh is coarsened to keep the cell count manageable. The heart of this VOF to DPM model is an algorithm that looks for liquid lumps that get separated from the main liquid body of the spray and then converts them into point masses for further tracking. Mesh adaption can also be used to help accurately and efficiently simulate multiphase simulations, like that of a liquid jet breaking up. The volume of fluid (VOF) to discrete phase model (DPM) hybrid multiphase model is used in conjunction with dynamic mesh adaption. The VOF model tracks the liquid-gas interface while the DPM is a separate solver that tracks discrete particles suspended in a Eulerian phase.