Hello, I am trying to imple
I am trying to implement a generalised power law model for blood viscosity (Ballyk et al, Biorheology, 31 (5), pp 565-586 (1994). In this model the exponent in the power law is a function of the local strain rate. My implemented calcNu() funciton is:
// * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * * //
Foam::viscosityModels::GeneralisedPowerLaw::calcNu () const
return ((nu0_*exp(-(scalar(1)+(sr())/a_)*exp(-b_/(sr())))+nuInf_)*pow(sr(),(nInf_-n0_*e xp(-(scalar(1)+sr()/c_)*exp(-d_/sr()))-scalar(1))));
Unfortunately, this fails to compile giving the following error messages:
Making dependency list for source file viscosityModels/GeneralisedPowerLaw/GeneralisedPowerLaw.C
SOURCE=viscosityModels/GeneralisedPowerLaw/GeneralisedPowerLaw.C ; g++ -m32 -Dlinux -DDP -Wall -Wno-strict-aliasing -Wextra -Wno-unused-parameter -Wold-style-cast -O3 -DNoRepository -ftemplate-depth-40 -I.. -I/home/peter/OpenFOAM/OpenFOAM-1.5/src/finiteVolume/lnInclude -IlnInclude -I. -I/home/peter/OpenFOAM/OpenFOAM-1.5/src/OpenFOAM/lnInclude -I/home/peter/OpenFOAM/OpenFOAM-1.5/src/OSspecific/Unix/lnInclude -fPIC -pthread -c $SOURCE -o Make/linuxGccDPOpt/GeneralisedPowerLaw.o
/home/peter/OpenFOAM/OpenFOAM-1.5/src/OpenFOAM/lnInclude/GeometricScalarField.C: In function 'Foam::tmp<foam::geometricfield<double,> > Foam::pow(const Foam::GeometricField<double,>&, const Foam::tmp<foam::geometricfield<double,> >&) [with PatchField = Foam::fvPatchField, GeoMesh = Foam::volMesh]':
viscosityModels/GeneralisedPowerLaw/GeneralisedPowerLaw.C:61: instantiated from here
/home/peter/OpenFOAM/OpenFOAM-1.5/src/OpenFOAM/lnInclude/GeometricScalarField.C: 220: error: no matching function for call to 'Foam::dimensioned<double>::dimensioned(const char , double, const Foam::dimensionSet&)'
/home/peter/OpenFOAM/OpenFOAM-1.5/src/OpenFOAM/lnInclude/dimensionedType.C:112: note: candidates are: Foam::dimensioned<type>::dimensioned(const Foam::word&, const Foam::dimensionSet&, Foam::Istream&) [with Type = double]
/home/peter/OpenFOAM/OpenFOAM-1.5/src/OpenFOAM/lnInclude/dimensionedType.C:98: note: Foam::dimensioned<type>::dimensioned(const Foam::word&, Foam::Istream&) [with Type = double]
/home/peter/OpenFOAM/OpenFOAM-1.5/src/OpenFOAM/lnInclude/dimensionedType.C:85: note: Foam::dimensioned<type>::dimensioned(Foam::Istream &) [with Type = double]
/home/peter/OpenFOAM/OpenFOAM-1.5/src/OpenFOAM/lnInclude/dimensionedType.H:95: note: Foam::dimensioned<type>::dimensioned(const Type&) [with Type = double]
/home/peter/OpenFOAM/OpenFOAM-1.5/src/OpenFOAM/lnInclude/dimensionedType.C:73: note: Foam::dimensioned<type>::dimensioned(const Foam::word&, const Foam::dimensioned<type>&) [with Type = double]
/home/peter/OpenFOAM/OpenFOAM-1.5/src/OpenFOAM/lnInclude/dimensionedType.C:60: note: Foam::dimensioned<type>::dimensioned(const Foam::word&, const Foam::dimensionSet&, Type) [with Type = double]
/home/peter/OpenFOAM/OpenFOAM-1.5/src/OpenFOAM/lnInclude/dimensionedScalarFwd.H: 42: note: Foam::dimensioned<double>::dimensioned(const Foam::dimensioned<double>&)
make: *** [Make/linuxGccDPOpt/GeneralisedPowerLaw.o] Error 1
I believe the error is due to the fact that in the function pow(a,b), b must be a scalar. In my model b would be a volScalarField (I think).
Is there some way to overcome this problem? Perhaps I have misinterpreted the error messages and there is something else wrong. Any insights would be appreciated.
Should look before I type. You
Should look before I type. You gave a value. But the order is wrong
Dear Bernhard, Thanks for y
Thanks for your input. I found the relevant part of Doxygen, but being in the throes of learning C++, I don't really understand it. I changed by code to read:
Foam::viscosityModels::GeneralisedPowerLaw::calcNu () const
All the variables nu0_, nuInf_, n0_, a_, b_, c_ and d_ are dimensionedScalars.
I still get the same error message on compilation, which I don't understand.
At the risk of sounding incredibly thick, I don't know what you mean about the order being wrong.
Any insights would be much appreciated.
Hi Petr! It says that somew
It says that somewhere (the file /home/peter/OpenFOAM/OpenFOAM-1.5/src/OpenFOAM/lnInclude/GeometricScalarField.C line 220) it tries to construct a dimensioned scalar with the arguments
const char , double, const Foam::dimensionSet&
but amongest the constructors the appropriate one would be
(const Foam::word&, const Foam::dimensionSet&, Type) [with Type = double]
And now comes the strange thing: that is definitly not your source and the offending line says
dimensionedScalar("1", 1.0, gsf2.dimensions())
which is in my opinion the wrong order. Now there are two options:
a) I am completly wrong (which is not unheard of)
b) you are the first person to instantiate that template and that is the reason why this typo was never found. To verify do the following: switch 1.0 and gf2.dimensions() in that file and try to recompile your stuff. If that makes the error go away then report it as a bug
Dear Bernhard, You were cor
You were correct. I had to make the switch in three places. But it all works well now (having solved a few other problems along the way).
Thank you very much for your help.
I am trying to implement a new viscosity model (Ellis mode), which is similar to the crossPowerLaw model. The difference is, Ellis model does not have nuInf and instead of "shear rate" it has "shear stress". For nuInf I can easily drop it from the code but for implementing shear stress I have a little problem.
I think for shear stress I have to use:
The problem is I do not know how exactly implement these stuff in the code. Also I think because of the mu(=nu*rho), I need to define a loop for shear stress, but I don't know how to do that and where to put it in the code.
Could anyone help me with this? any idea?
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overwrite them with my calculation, it works fine, but there should be a smarter way...
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