Learning Forum

[AhmadMwaheb]

[Aitor]

Assuming that you have chosen velocity-inlet boundary condition at Inlet 1, the solver only uses the value of the velocity. The problem is overspecified if you set both velocity and pressure.n

[Rob]

You're forcing a fixed amount of flow through the system. Can you double check you're running axi-symmetric over 2d and that you have enough mesh to pick up any flow features. n

[AhmadMwaheb]

Assuming that you have chosen "velocity-inlet" boundary condition at Inlet 1, the solver only uses the value of the velocity. The problem is overspecified if you set both velocity and pressure.https://forum.ansys.com/discussion/comment/110324#Comment_110324

So how can I solve the problem correctly? In

[YasserSelima]

Are you using Pressure-based solver?n

[YasserSelima]

The resolution of your velocity vectors shows that you have very coarse mesh. Being able to select velocity and pressure at inlet, probably you are using wrong solver.n

[AhmadMwaheb]

I don't get what you mean with picking up any flow features. I'm applying 2D axissymetric. The pressure is high because he want to equalizing the pressure at the the exit of the outlet (-20) ? should I make the inlet, pressure unlet and n

You're forcing a fixed amount of flow through the system. Can you double check you're running axi-symmetric over 2d and that you have enough mesh to pick up any flow features.https://forum.ansys.com/discussion/comment/110328#Comment_110328

give a value of the velocity as a dynamic pressure?n

[AhmadMwaheb]

Are you using Pressure-based solver?https://forum.ansys.com/discussion/comment/110706#Comment_110706

yes preesure solvern

[YasserSelima]

Where did you set the 50 Pa pressure?n

[AhmadMwaheb]

At the inlet.n

[AhmadMwaheb]

SO I really need to know how to input both Velocity and pressure without making an issue? I was worng when I was putting 50 Pa as supersonic pressure.

[YasserSelima]

You can not have both velocity and pressure at the same boundary unless you have supersonic flow which is not your case. Set the inlet as velocity inlet, and the outlet as pressure outlet. But you need to refine your mesh. Probably you need 5 times this number of cells with inflation at the wall to get realistic values.n