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The drag is calculated by integrating the shear and pressure at the wall. The drag coefficient is then calculated by non-dimensionalizing the drag. The reference entities used in the non-dimensionalization are defined in the Reference Values panel in Fluent. Note that the "Reference Values" will not change your solution for the velocity and pressure at the cell centers. It will affect only the drag coefficient and any other non-dimensional quantities calculated from the solution. Watch the following video for demonstrations:
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<iframe width="600" height="338" src="//www.youtube.com/embed/xmq43t6hbi4" frameborder="0" allowfullscreen></iframe>
If you have used SpaceClaim to create the geometry, refer to the steps below for Total Surface Area
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Parameter | Input Value |
|---|---|
Area(m^2) | 0.0013245001324 |
Density(kg/m^3) | 1060 |
Velocity (m/s) | 0.315 |
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<iframe width="600" height="338" src="https://www.youtube.com/embed/rRNZml_hyfwcFdOaC-SR-E" frameborder="0" allowfullscreen></iframe> |
Summary for the video:
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Calculation activities -> Create -> Solution Data Export -> Change File Type to "CFD-Post Compatible"
Quantities for export:
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Quantities
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Static Pressure
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Total Pressure
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Velocity Magnitude
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x velocity
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y velocity
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z velocity
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wall shear
* note that you need to export all three components of velocity in order to plot vector field in CFD-Post!
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If you are using ANSYS 19.2, refer to the steps below:
- Setup > Reference values > Type in the values given in the above table
- Report Monitors > New > Force Report > Drag > wall artery
- Solution Initialization > Hybrid Initialization > Initialize
- Calculation Activities > Create > Solution Data Export
- Change file type to “CDAT for CFD Post and Ensight”
- Select above mentioned quantities for export
- Calculation Activities > Create > Particle Data History Export > Select both injections
- Run Calculation > Time Step Size(s) 0.01 > Number of Time Steps 50 > Maximum Iterations/Time Step 200 > Hit Calculate
Before running the calculation, you should also create a monitor for the inlet velocity so that we can check that the UDF is working correctly in the Verification and Validation step.
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