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VWT: resultant Force&Moment and advanced Postprocessing

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I wanted to know if it is possible to calculate the resultant Force (or Moment) on an object in Virtal Wind Tunnel.

I am simulating an undertray with diffusor. VWT is  only showing the lift-, drag-,.. coefficients in the "analysis.pdf"-report.

It would be great if i could see:

- resultant Force on the entire car (e.g. total Downforce)

- component Forces on the entire car (e.g. Downforce and Drag)

- resultant Force on every component

- component Forces on every component




I found the option "Extended surface result output" which i can activate for every component. But i don't know how to make use of it. Can you please explain "output frequency" and "keep all output files - All or Last". Where is the difference and why VWT don't shows those Force in the "analysis.pdf"?


Are there more ways to calculate Forces instead of coefficents? (if extended surface output is the answer)


Is there also a way to calculate the forces of my latest simulations with the data i got in the report or files without simulating them again?



How can i watch my simulation (e.g. flow flield or pressures) with HyperView or HyperGraph? Or should i better use AcuFieldView? (What programs can i use for post processing? What are the benefits of those compared to each other?)

Are there step-by-step tutorials for those programs? Where can i find them?

How can i open my simulation with those programs?




Is there a list of command controlls for VWT?

Where can i find advanced tutorials for postprocessing and simulating with VWT?



Please try to answer with step by step explanations. If i need to enter a command in the VWT console please write the command similary so that i can copy&paste it.


Thank you.



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1. At the moment, there is no direct output of forces. However there are some methods to get those.

Using AcuProbe, open vwtAnalysis.*.Log file from the run folder. Forces can be plotted using "Traction" under Surface Outputs.

It is possible to get the same from AcuSolve Command Prompt using the command "AcuTrans".  Refer to Command Reference Manual in the AcuSolve installation folder.

It is possible to use script to get total forces. (Best to contact Local Altair office)


2. You can use either AcuFieldView or HyperView. Both have a direct AcuSolve Log file reader.


3. VWT will allow more user controls in the future release.


I would suggest that you visit AcuSolve Training at local Altair office. That would help you understand more about AcuSolve, as it is the solver working behind VWT.

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