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Dynamic Mesh Training in ANSYS Fluent

Dynamic Mesh introduction

In ANSYS Fluent, we use the dynamic mesh capability to simulate problems with boundary motion. such as check valves and store separations. The building blocks for dynamic mesh capabilities within ANSYS Fluent are three dynamic mesh schemes. Namely, smoothing, layering, and remeshing.  We use a combination of these three schemes to tackle the most challenging dynamic mesh problems. However, for simple dynamic mesh problems involving linear boundary motion, the layering scheme is often suﬃcient.

Dynamic Mesh for ﬂow around a check valve

For example, we can simulate ﬂow around a check valve using only the layering scheme. In this tutorial, we use such a case to demonstrate the layering feature of the dynamic mesh capability in ANSYS Fluent.

Check valves are commonly used to allow unidirectional ﬂow. For instance,  to act as a pressure-relieving device by only allowing ﬂuid to leave the domain when the pressure is higher than a certain level. In such a case, the check valve is connected to a spring that acts to push the valve to the valve seat and to shut the ﬂow. But when the pressure force on the valve is greater than the spring force, the valve will move away from the valve seat and allow ﬂuid to leave. Thus, reducing the pressure upstream.
Gravity could be another factor in the force balance and can be considered in ANSYS FLUENT.

we neglect the deformation of the valve and thus allows for a rigid body Fluid Structure Interaction (FSI) calculation. For which a UDF is provided. This tutorial provides information for performing basic dynamic mesh calculations. This

This tutorial demonstrates how to do the following:

•    Use the dynamic mesh capability of ANSYS FLUENT to solve a simple ﬂow-driven rigid-body motion problem.
•    Set boundary conditions for internal ﬂow.
•   Use a compiled user-deﬁned function (UDF) to specify ﬂow-driven rigid-body motion.
•   Calculate a solution using the pressure-based solver.