Hi!

I am simulating an in-compressible steady flow through a Choke valve with the objective of validating the pressure drop through the valve against experimental values. The conditions are as stated:

Inlet mass flow = Outlet mass flow = 2.116 kg/s (through mass conservation)

P_inlet = 17.595 MPa

P_outlet (experimental) = 17.237 MPa

Area_inlet = Area_outlet = 0.00342 m^2

Rho_inlet = Rho_outlet = 994.98 kg/m^3 (constant)

I would like to prescribe the inlet pressure and measure the outlet pressure. For this, I have used P_inlet and Outlet mass flow, No-slip walls and Symmetry as my B.C.'s. The problem I am facing is that as soon as I prescribe the inlet (or exit) pressure, I get velocities in the domain exceeding 10^6 m/s which is of course not the case.

Below is the link to my project:

https://www.simscale.com/workbench/?pid=2450536785748278493#tab_2-0

The only way I get correct values for the pressure drop is if I set P_inlet = 0 Pa (gauge) and Outlet mass flow which gives me the Delta_P caused due to structures in the domain [Simulation run: Incompressible_Steady_State_April_24_Condition_1_A]. I would like to see the effect of changing input pressure keeping the mass flow constant through out the domain.

Looking at the project, do you think I have made a mistake somewhere in creating the simulation? I have tried multiple iterations of the boundary conditions (combinations of different conditions), but nothing seems to be working. Looking forward to your help! Thank you!

Cheers,

Aadit