[brams]

Hello there

I'm having trouble:
how to calculate the total mass of fluid in the model using UDF, at every time step?

My simulation is transient, with 1 inlet and 1 outlet.

I know that there's a feature in FLUENT (volume integral) option that can measure it easily, but I do need to create it via UDF for iteration purpose

Thanks, any help would be very helpful

[Bruno Machado]

Originally Posted by brams

Hello there

I'm having trouble:
how to calculate the total mass of fluid in the model using UDF, at every time step?

My simulation is transient, with 1 inlet and 1 outlet.

I know that there's a feature in FLUENT (volume integral) option that can measure it easily, but I do need to create it via UDF for iteration purpose

Thanks, any help would be very helpful

I made this very quick. Gotta be checked and also adapt it to every time step.

This is a on demand macro, but you can change it accordingly to your purpose.

DEFINE_ON_DEMAND(mass)
{
Domain *domain;
Thread *ct;
cell_t c;
domain = Get_Domain(1);
double mass;
thread_loop_c(ct, domain)
{
begin_c_loop(c,ct)
{
mass += C_R(c,ct) * C_VOLUME(c,ct);
}
end_c_loop(c,ct)
}
}

[brams]

Thank you Bruno!

I modified it to Define_Execute_At_End, and it works well, calculate the total mass in the model

But now, I have to calculate the mass of specific phase onl. Since my simulation is consisted of many phases.

What is the additional syntax to get total mass of 1 phase only, not all of phases?

Thank you