The Design – Simulating Rotary using Dynamic Mesh and Six DOF | Ansys Fluent
In most CFD projects, we design geometry, create a static mesh for geometry, and simulate this by fix mesh. But sometimes we want to move some boundary or we have deforming shape during times. We must use the dynamic mesh method. For example, in most aerodynamic problems we use fix mesh for our simulation but you can imagine there are two airplanes that are getting closer and you want to know the effect of fluid flow behavior around airplanes and determine the interaction between them during the time. So the relative position them are changing during the time and should be modeled using the dynamic mesh method. By using this method, mesh size and shape will be changed. If we use the re-meshing or layering method, the number of an element also will be changed. The dynamic mesh method is entirely different from moving and sliding mesh also moving reference frames. In moving mesh whole zone rotates or translates in some direction but in dynamic mesh, the method boundary starts to translate or transform. We can apply a predefined velocity by UDF or profile for boundaries or velocity of an object that can be predicted based on fluid flow and gravity force balance. If we want to know the velocity of the object based on this balance we should use the Six DOF dynamic mesh method.
Mesh quality during change should be conserved. ANSYS fluent has three different methods for changing mesh, smoothing, re-meshing, and layering.
In this analysis, it has been tried to simulate and analyze the airflow around a rotary design modeler using the ANSYS Fluent software.
Geometry & Grid
The geometry required for this analysis has been generated by ANSYS Design Modeler software. The meshing required for this analysis is also generated by ANSYS Meshing software. The mesh-type used in this analysis is all triangles method and the volume properties of the geometry model for this rotary design modeler geometry are 14524 mm³.
In this analysis, the k-epsilon (2 equation) turbulence viscosity model is used to check the fluid flow. The standard wall function is used near the wall. In this analysis, the Six DOF dynamic mesh method is used to model the rotation.
In this analysis, the flow inlet, which only includes the water, is defined as two velocity inlet. The velocity magnitude value of the inlet is 20 m/s. The turbulence of the design modeler is set as a medium with an intensity equal to 5 %. The turbulence of the design modeler is set as a medium with a viscosity ratio equal to 10.
In this analysis, the output flow type is PRESSURE OUTLET and the gauge pressure is equal to 0 Pa.
Discretization of Equations
According to the type of flow, the SIMPLE algorithm is used to discretize the Pressure-Velocity Coupling of the solution method. The momentum equation has been discretized in the Second Order Upwind.
The results are presented as velocity and pressure contours as well as streamlines.
The Design Services
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