[psapercace]

Hi,
I'm new to Openfoam and wondering how to change parameters automatically after a successful run. I have a pipe with constant inlet velocity which is simulated with SimpleFoam (in laminar mode). I want to increase the Reynolds number (by changing the inlet velocity or the kinematic viscosity) after each successful run with the solver and then rerun the solver and I want to find an automatic way to do that. This is easily done in COMSOL using a parametric sweep, but I'm wondering how it can be done in Openfoam.

[clapointe]

This can be done easily using a bash script. There are many ways to accomplish this, but one possible way in pesudo code :

for i in ...
cp baseCase case_$i
cd case_$i
sed 0/U (0 $i 0)
Allrun
cd ..

Where you have a (clean) case, call it baseCase, that gets copied some number of times. You then enter the new case directory, use sed to edit a file (in this case 0/U), and then the case can be run using an Allrun script like those used in foam tutorials. So looking into for loops and sed should put you on the right path.

Caelan

[psapercace]

Originally Posted by clapointe

This can be done easily using a bash script. There are many ways to accomplish this, but one possible way in pesudo code :

for i in ...
cp baseCase case_$i
cd case_$i
sed 0/U (0 $i 0)
Allrun
cd ..

Where you have a (clean) case, call it baseCase, that gets copied some number of times. You then enter the new case directory, use sed to edit a file (in this case 0/U), and then the case can be run using an Allrun script like those used in foam tutorials. So looking into for loops and sed should put you on the right path.

Caelan

It worked perfectly. Thanks.

[openFo]

Hi,
To add to this for future searchers. I would recommend using a tool like PyFoam or better caseFoam (https://github.com/DLR-RY/caseFoam). The latter is designed to do parameter studies. I can highly recommend it.