As a first step we need to create a new simulation. To create a simulation left click on external flow simulation and then on Create Simulation.
This dialog box allows the user to select the simulation model. Click on ‘Incompressible’.
The default settings for the simulation are kept the same. Save the simulation model by clicking on the tick mark.
Left click on the mesh icon to create a new mesh.
Choose the Hex-Dominant parametric (only CFD) Algorithm.
Select the number of cells in each direction for Bounding Box as shown in the figure below.
Scroll down to specify the Number of computing cores for the meshing operation (16 in this tutorial)
BACKGROUND MESH BOX
An important parameter is the size of the base box, which is used as the surrounding fluid domain.
To change the size of the box click on Background Mesh Box expand geometry primitives under Mesh and change the coordinates of Background mesh Box as shown below
Material point: This is the parameter the algorithm uses to determine wether the mesh is created inside a shape or outside. In this case this point therefore lies within the base mesh box but outside the body.
Select the Material Point and give the coordinates as below:
Material Point Coordinates for external flow simulation
In order to resolve the features of the vehicle accurately you can add a Feature Refinement under the Mesh Refinements.
Click on Refinements and add an feature refinement and keep the default values as mentioned below.
Feature refinement settings for meshing
In order to have a finer mesh over the surface of the body, we add surface refinement.
Click on Refinements to add a new refinement and select surface refinement
We keep the Minimum and Maximum Refinement levels at 2 and we select the entire volume by using volume select icon
Boundary Layer Refinement
Select the Inflate Boundary layer setting
keep the default settings in the dialog box
The next step is to pick the faces.
All faces except the inlet and outlet faces need to be selected.
Select all the faces of the pipe by dragging the Active box selection over the pipe and deselect the inlet and outlet faces by clicking on them.
After the mesh generation we need to select the mesh as our domain of simulation.
Click on generate mesh clip to inspect the internal mesh. Adjust the settings of the normal. Click on generate mesh clip icon.
The boundary layer is clearly visible on zooming
Hide all the bounding faces to view the surface refinement on our body
Last updated: April 12th, 2019
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