[yhy20081016]

Hello everybody,
I have two FLUENT cases and their meshes and boundary conditions are identical. The difference is that the two cases are computed with different solver settings (time step size, spatial discretization scheme, etc.). Now I want to compare these two cases. Does anybody know whether I can subtract these two cases in Tecplot? (for instance, subtract the velocity field of case 2 from that of case 1, then I can examine the difference of velocity field between these two cases)

[Svetlana]

- Export the data from Fluent to Tecplot.
- Load both data sets into Tecplot.
- Data → Create Zone → Duplicate. Duplicate any zone you like, click OK.
- Data → Alter → Specify equations. Select the third zone. Write {VARNAME}={VARNAME}[2]-{VARNAME}[1], replacing VARNAME with the variable name of interest. Click Compute.

[yhy20081016]

Originally Posted by Светлана

- Export the data from Fluent to Tecplot.
- Load both data sets into Tecplot.
- Data → Create Zone → Duplicate. Duplicate any zone you like, click OK.
- Data → Alter → Specify equations. Select the third zone. Write {VARNAME}={VARNAME}[2]-{VARNAME}[1], replacing VARNAME with the variable name of interest. Click Compute.

Thank you very much.

[Svetlana]

You're welcome.

[deenriqu]

In newer versions of Tecplot (360) you dont have to export first. You can just load in a cas/dat file. Then load in another cas/dat pair and click "append data" in the pop up

[Svetlana]

Thanks deenriqu, you are right and it makes the comparison a lot easier