Author: John Singleton and Rajesh Bhaskaran, Cornell University Problem Specification |
In this section the geometry will be meshed with 3000 elements. That is, the field will be divided into 50 elements in the x direction and 60 elements in the y direction.
In order to begin the meshing process, go to the Workbench Project Page, then (Double Click) Mesh.
In this section the default mesh will be generated. In order to generate the default mesh first click on Mesh, then click on Update as shown in the image below.
You should then obtain the following mesh.
https://confluence.cornell.edu/download/attachments/90737915/DefaultMesh_Full.png |
For this particular problem, we are interested in creating a grid style of mesh that can be mapped to a rectangular domain. This meshing style is called Mapped Face Meshing. In order to incorporate this meshing style (Click) Mesh Control > Mapped Face Meshing as can be seen below.
https://confluence.cornell.edu/download/attachments/85624045/MenuMappedFaceMeshing_Full.png |
https://confluence.cornell.edu/download/attachments/85624045/SelectApply_Full.png |
https://confluence.cornell.edu/download/attachments/111221571/Mapped+Face.gif |
The desired mesh has a specific number of divisions in the x direction and a specific number of divisions in the y direction. In order to obtain the specified number of divisions Edge Sizing must be used. The divisions in the x direction will be specified first. Now, an Edge Sizing needs to be inserted. First, (Click) Mesh Control > Sizing as shown below.
https://confluence.cornell.edu/download/attachments/85624045/MenuSizing_Full.png |
https://confluence.cornell.edu/download/attachments/85624045/DetSizing_Full.png |
https://confluence.cornell.edu/download/attachments/85624045/NumbDiv_Full.png |
https://confluence.cornell.edu/download/attachments/90737915/DefEdgeMesh_Full.png |
We would like to have more elements in the region very close to the flate plate and less elements in the far field. In order to do this, we must bias the edge sizing. First, click on Edge Sizing 2, then click on Bias Type and set it to the first option as shown below.
Next, set the Bias Factor to 70 as shown below. The Bias Factor is defined in this case to be the ratio of the longest division and the shortest division. That is, the last division will be seventy times longer than the length of the first division.
Now, the biasing needs to be specified for the right side of the geometry. In order to incorporate the biasing on the right side a new Edge Sizing needs to be implemented. First, (Click) Mesh Control > Sizing. Then, select and apply the left side of the geometry. Then, change Type to Number of Divisions and set Number of Divisions to 60. Next, set Behavior to Hard and set Bias Type to the second option, as shown below.
Then, set the Bias Factor to 70. Lastly, click Update to generate the new mesh. You should obtain the following mesh.
https://confluence.cornell.edu/download/attachments/90737915/Mesh2_Full.png |
Here, the edges of the geometry will be given names so one can assign boundary conditions in FLUENT in later steps. The left side of the geometry will be called "inlet" and the right side will be called "outlet". The top side of the rectangle will be called "far_field" and the bottom side of the rectangle will be called "plate" as shown in the image below.
https://confluence.cornell.edu/download/attachments/90737915/NamedSelectionsNames_Full.png |
First save the project. Next, close the Mesher window. Then, go to the Workbench Project Page and click the Update Project button, .
Go to Step 4: Setup (Physics)
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