code_saturne User's Forum

Hi,

I am having problems calculating the pressure gradient in v2.2. Should I be using grdcel or grdpot? What is the difference between these subroutines?

Thanks,

James

Hello James,

to compute the gradient of any potential field (such as the pressure field) use grdpot, to compute the gradient of any scalar field which is not a potential (such as the Temperature) use grdcel, and to compute the gradient of vector fields (such as the velocity or the mesh velocity) use grdvec.
The difference reads on the fact that for a potential field we do specific treatment (for instance we could add a linear field to it...).

Cheers,

Martin

Thanks Martin it all makes more sense now!