| Cyp |
August 16, 2010 13:12 |
problem with gradient as source term in coupled equations
Hi!
I am trying to implement the following equations in OpenFOAM. There are nspecies resolution of these coupled equations according to the number of species in the system.
http://img148.imageshack.us/img148/6...reenshot1v.png
I have a problem with the implementation of the A-species evaporation rate. There is an error when compiling the code because of the gradient terms in the calculation of Sevap[i].
Code:
// Species transport calculation
for (int i=0; i<= nspecies; i++)
{
volScalarField& Y_beta_i = Y_beta[i];
volScalarField& Y_gamma_i = Y_gamma[i];
Sevap[i] = U_gamma_beta[i] & fvc::grad(Y_gamma_i) -U_beta_gamma[i] & fvc::grad(Y_beta_i) - alpha[i]*(H[i]*Y_gamma_i-Y_beta_i);
mass_evap += Sevap[i];
solve
(
fvm::ddt(eps_beta*rho_beta, Y_beta_i)
+ fvm::div(phi_beta, Y_beta_i)
==
fvm::laplacian(eps_beta*rho_beta*D_beta_beta[i] , Y_beta_i)
+ fvm::laplacian(eps_beta*rho_beta*D_beta_gamma[i], Y_gamma_i)
+ Sevap[i]
);
solve
(
fvm::ddt(eps_gamma*rho_gamma, Y_gamma_i)
+ fvm::div(phi_gamma, Y_gamma_i)
==
fvm::laplacian(eps_gamma*rho_gamma*D_gamma_gamma[i], Y_gamma_i)
+ fvm::laplacian(eps_gamma*rho_gamma*D_gamma_beta[i] , Y_beta_i)
- Sevap[i]
);
}
Here the velocity-like coefficients U_beta_gamma and U_gamma_beta are declared as
Code:
PtrList<dimensionedVector> U_gamma_beta(nspecies);
PtrList<dimensionedVector> U_beta_gamma(nspecies);
Do you have any suggestion ??
Moreover, I saw that there is a FvCoupledScalarMatrix class existing. Do you think it is useful in my case or the sequential method can be sufficient enough ?
Regards,
Cyp |
