Skip to content

Update compressibility calculation for real fluid in CanteraMixture.H #303

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
zhixchen merged 1 commit into from
Jun 27, 2023
Merged

Update compressibility calculation for real fluid in CanteraMixture.H #303

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
20 changes: 18 additions & 2 deletions src/dfCanteraMixture/CanteraMixture.H
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -119,8 +119,24 @@ public:
const scalar& T
) const
{
// for ideal gas, psi = CanteraGas_->density()/p = 1/RT
return CanteraGas_->density()/p;
const Cantera::AnyMap& map = CanteraGas_->input();
if(map["thermo"].asString()=="Peng-Robinson" || map["thermo"].asString()=="Redlich-Kwong")
{
// for non-ideal EoS, psi = \partial rho/ \partial p at constant enthalpy
// Currently, Peng-Robinson and Redlich-Kwong are available in Cantera
// The partial derivative was approximated using backward difference with a step size dx
double h0 = CanteraGas_->enthalpy_mass();
double dx = 0.0001;
double rho1 = CanteraGas_->density();
CanteraGas_->setState_HP(h0,p*(1-dx));
double rho2 = CanteraGas_->density();
return (rho1-rho2)/(dx*p);
}
else
{
// for ideal gas, psi = W/RT
return CanteraGas_->meanMolecularWeight()/CanteraGas_->RT();
}
}

scalar rho
Expand Down