Turbulence model implementation errors
I have implemented a non-linear eddy viscosity model, by modifying the kOmegaSST and including additional non-linear terms (code attached). I get a number of errors as:
no matching function to call to 'Foam:: .....'
final error as:
Is IV_ a scalar or tensor?
If it is a scalar there should be a normal matrix multiplication somewhere
IV_( S_&& (W_ & W_) )
some other issues...
C1prime_ is defined as a volScalarField, but its just a constant, so I would change it to dimensionedScalar, otherwise you need to supply size information et.c....
Beta2_ is a volScalarField, but you cant just initialize it with a value it needs more information than
that. (same error as C1prime_)
To get it to compile i just set it to
Beta2_( 0.*N_), // why use a volScalarField for a zero?
but Im guessing that it really should be something else, otherwise why have it :)
aij_ is a symmetric tensor
W_ is a tensor and
W_ & W_ is just a tensor multiplication, this does not imply that the result is a symmetric tensor.
sure in this example it will be, but the code sees this as any other tensor multiplication
so you need to explicitly extract the symmetric part.
+ Beta2_ * ( (S_ & S_)-(1./3.)*(IIs_ * I ))
+ Beta3_ * (symm(W_ & W_)-(1./3.)*( IIo_*I)) // why should a tensor multiplication yield a symm tensor?
+ Beta4_*symm((S_ & W_)-(W_ & S_))
+ Beta6_*(symm(((S_ & W_) & W_) + ((W_ & W_) & S_)) - (2./3.)*IV_*I - IIo_*S_)
+ Beta9_*(symm(((W_ & S_) & (W_ & W_)) - ((W_ & W_) & (S_ & W_)) + 0.5*IIo_*((S_ & W_) - (W_ & S_))))
Thanks, after making changes you suggested, it is working! I did this for aij_ ,
In the constructor portion of my BSLEARSM.C (attached) , can you please tell me how I can include this code:
in the tensor class the multiplication operation between two tensors returns another tensor,
not a symmetric tensor.
This is a good start if the dimensions of IIs_ and N_ are the same otherwise use another field
which has the same dimensions as N_ or a constructor like the one for nut_.
For that kind of complicated expressions you have to place it in here.
Hi, I am also using this model.
Which reference did you use to write this model.
Because your correlations are a little different with mine.
I used the formulation described here:
"Explicit Algebraic Reynolds Stress Models for Anisotropic Wall-Bounded Flows", F.R. Menter, A.V. Garbaruk, and Y. Egorov.
EUCASS – 3rd European Conference for Aero-Space Sciences, July 6-9th 2009 Versailles
Does this model work well?
I use the formula of " Wallin, S. and A. Johansson (2000). "An explicit algebraic Reynolds stress model for incompressible and compressible turbulent flows." Journal of Fluid Mechanics 403: 89-132 ", it does not work quite well.
I want to try this one you use. Would you mind to send me the reference you use because I cannot find the file.
my mail: email@example.com
I am also using the WJ model. The reference you are using seem much newer.
Would it be possible for you to send me copy as well please: firstname.lastname@example.org
I recently had a similar issue when implementing Wilcox 1998 k-omega model (http://turbmodels.larc.nasa.gov/wilcox.html), which is different than the k-omega model implemented in OF (Wilcox 1988 k-omega model).
I have the following expression
Why should it be placed there and how is that related to the complexity of the expression?
Thanks and best regards,
|All times are GMT -4. The time now is 19:16.|