I am getting the following err
I am getting the following error.
----------------------------------------------- --> FOAM FATAL ERROR : incompatible dimensions for operation [U[0 1 -1 0 0 0 0] ] - [U[0 -1 0 0 0 0 0] ] From function checkMethod(const fvMatrix<type>&, const fvMatrix<type>&) in file /home/faroque/OpenFOAM/OpenFOAM-1.3/src/finiteVolume/lnInclude/fvMatrix.C at line 1024. FOAM aborting Foam::error::printStack(Foam:http://www.cfd-online.com/OpenFOAM_D...part/proud.gifstream&) Foam::error::abort() ./newApp [0x80525e5] ./newApp [0x8061e31] ./newApp [0x804f354] __libc_start_main __gxx_personality_v0 0Aborted --------------------------------------------- It seem to me problem in the dimension defition for my volScalarField variable. I defined variable dimension like follwoing: dimension [0 0 0 1 0 0 0] Could someone help me? |
Your error says the simulation
Your error says the simulation has failed in the momentum equation - one of the terms you've added has got wrong dimensions.
Hrv |
Thanks for the reply.
I have
Thanks for the reply.
I have set the equation in following way.. ------------------------------------------------- solve ( fvm::ddt(T) == fvm::laplacian(T) ); -------------------------------------------------- where T is a volScalarField. Did I make any mistake here? -- Faroque |
Hi,
there should be a trans
Hi,
there should be a transportcoefficient for temperatur in this kind of equation?! sth like: a*ddt(T)=laplaceian(T),where a is sth like rho*c/lambda. otherwise your dimensions are K/s on the left side and K/m^2 on the right side. for the value of the transport coefficient you should look i a textbook to find something for your material... stephan |
hi,
if u want to use the e
hi,
if u want to use the equation like that the code should looke like: solve ( fvm::ddt(T) - fvm::laplacian( dimensionedScalar ( "scal", dimensionSet(0, 2, -1, 0, 0), 1), T) ); } Actually u just multiply with a scalar with unit value 1[m2/s] Adrian |
Isn't there a way to tell the
Isn't there a way to tell the solver that space and time variables used for the derivation are dimensionless ?
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