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[swak4Foam] Grouping patches in swak4foam

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Old   November 8, 2021, 08:27
Default Grouping patches in swak4foam
  #1
pad
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Hi all,

I have tried searching for a solution to my "problem" but so far I only came across Possible to sum across different patches? which seems clutter my code with similar expressions

I have a number of patches which might change in number so to avoid too much editing of code from simulation to simulation with the risk of missing something I would like to go from

Code:
"pressure{patch1}=p*rho*normal()*area();"
...
"pressure{patchN}=p*rho*normal()*area();"
to something like
Code:
										
grouped_patches
(
    patch1
    ...
    patchN
)
"pressure{grouped_patches}=p*rho*normal()*area();"
Does anyone know if this is possible in swak4foam to do it directly in the external expressions? I looked through the reference but couldn't find a solution.

Any help is appreciated
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Old   November 12, 2021, 05:14
Default Workaround/solution found but new issue with fields
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pad
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So it seems creating a faceSet with topoSet for all the patches I want would do the job in this particular case.

Code:
"pressure{faceSet'grouped_patches}=p*rho*normal()*area();"
However, when it comes to extracting viscous forces I have come to another hold since
Code:
"viscous{faceSet'grouped_patches}=sum(-nu*snGrad(U)*area());"
doesn't work due to the field snGrad(U) is not existing or of wrong type. So snGrad(U) cannot be used on a faceSet. Does anyone know how to work around this?

Also, doing the following gives a similar missing field error on the density.
Code:
"density=997;"
"pressure_forces{faceSet'grouped_patches}=density*sum(p*normal()*area());"
while
Code:
"density=997;"
"pressure_forces{faceSet'grouped_patches}=sum(p*normal()*area());"
"pressure_forces_density=density*pressure_forces;"
seems to work OK. Have I completely misunderstood how variables are defined or is there a bug in swak4foam when it comes to the last field error with density?
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Last edited by pad; November 14, 2021 at 11:26.
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