[nikosb]

Hi,

I am a newbie to OpenFoam. I ran a laminar simulation of the flow around a sphere and I want to compute the wall shear stress and skin friction on the surface of the sphere. When I type

postProcess -func wallShearStress -time latestTime

I get this error message:

--> FOAM FATAL ERROR:
Unable to find turbulence model in the database

From function virtual bool Foam::functionObjects::wallShearStress::execute()
in file wallShearStress/wallShearStress.C at line 200.

From what I read the wallshearstress includes the turbulent shear stresses which in my case don't exist. How can I compute the wall shear stress on a laminar simulation ran with icoFoam?

[sudo_rm]

Hi,

If you check the options for icoFoam you will see that there is no "postProcess" available

icoFoam:

Usage: icoFoam [OPTIONS]
options:
  -case <dir>       specify alternate case directory, default is the cwd
  -fileHandler <handler>
                    override the fileHandler
  -hostRoots <(((host1 dir1) .. (hostN dirN))>
                    slave root directories (per host) for distributed running
  -libs <(lib1 .. libN)>
                    pre-load libraries
  -listFunctionObjects
                    List functionObjects
  -listScalarBCs    List scalar field boundary conditions (fvPatchField<scalar>)
  -listSwitches     List all available debug, info and optimisation switches
  -listVectorBCs    List vector field boundary conditions (fvPatchField<vector>)
  -noFunctionObjects
                    do not execute functionObjects
  -parallel         run in parallel
  -roots <(dir1 .. dirN)>
                    slave root directories for distributed running
  -srcDoc           display source code in browser
  -doc              display application documentation in browser
  -help             print the usage

pimpleFoam:

Usage: pimpleFoam [OPTIONS]
options:
  -case <dir>       specify alternate case directory, default is the cwd
  -fileHandler <handler>
                    override the fileHandler
  -hostRoots <(((host1 dir1) .. (hostN dirN))>
                    slave root directories (per host) for distributed running
  -libs <(lib1 .. libN)>
                    pre-load libraries
  -listFunctionObjects
                    List functionObjects
  -listFvConstraints
                    List fvConstraints
  -listFvModels     List fvModels
  -listMomentumTransportModels
                    List momentumTransportModels
  -listScalarBCs    List scalar field boundary conditions (fvPatchField<scalar>)
  -listSwitches     List all available debug, info and optimisation switches
  -listVectorBCs    List vector field boundary conditions (fvPatchField<vector>)
  -noFunctionObjects
                    do not execute functionObjects
  -parallel         run in parallel
  -postProcess      Execute functionObjects only
  -roots <(dir1 .. dirN)>
                    slave root directories for distributed running
  -srcDoc           display source code in browser
  -doc              display application documentation in browser
  -help             print the usage

I suggest using pimpleFoam or pisoFoam instead, and just set "laminar" in the momentumTransport properties.

Hope that helps,

[Lleo]

Hi there!


I'm having the same problem when I submit the next comand:

postProcess -func wallShearStress

Then it jumps the same error you mentioned.
Could you explain how did you obtain the solution for that case? I'm using simpleFoam instead, and runing a laminar flow case.


Thanks!