[Zomzzz]

Hi
i am using simple foam and i am not that expert in open foam
the situation which i have now, that i have inlet which has known pressure
and for velocity boundary i want to have something like this

inlet
{ type fixedvalue
value ( calculated calculated 0) }

but the problem that simplefoam doesn't understand calculated

so is there any way to use the pressure inlet as given to open foam and then tell open foam to calculate inlet velocity based on pressure and fix this calculated value for all time steps and iteration.

[tomf]

Hi,

Probably you can use the pressureInletOutletVelocity boundary condition.

Regards,
Tom

[Zomzzz]

i think it is not exactly what i want because in pressureInletOutletVelocity boundary i will need to define both pressure and velocity values
i want just to define pressure values and velocity at inlet will be calculated based on that pressure value

[Yann]

Hello,

No need to specify a velocity with pressureInletOutletVelocity

Cheers,
Yann

[Zomzzz]

but i see in the guide that there is field for velocity:

<patchName>
{
type pressureInletOutletVelocity;
tangentialVelocity <field value>;
value <field value>;

// Optional entries
phi phi;
}

and regarding this boundary where it should be exactly located in p file or u file ?
and it is valid for simplefome ?

[Yann]

The tangential velocity parameter is optional: https://doc.openfoam.com/2312/tools/...utletVelocity/

This is a boundary condition for the U variable, and you can indeed use it with simpleFoam.

[Zomzzz]

okay so i define in the u file that the inlet is pressureInletOutletVelocity
like this:

inlet
{
// Mandatory entries
type pressureInletOutletVelocity;
}

and in p file i define the pressure of the in the inlet, correct ?
and last question, i want this inlet velocity to be as fixed value, so i want openfoam to calculate the velocity for the first time based on pressure and fix this calculated value for all simulation, will the pressureInletOutletVelocity do that ?

[Yann]

Originally Posted by Zomzzz

okay so i define in the u file that the inlet is pressureInletOutletVelocity
like this:

inlet
{
// Mandatory entries
type pressureInletOutletVelocity;
}

and in p file i define the pressure of the in the inlet, correct ?

Correct.

Originally Posted by Zomzzz

and last question, i want this inlet velocity to be as fixed value, so i want openfoam to calculate the velocity for the first time based on pressure and fix this calculated value for all simulation, will the pressureInletOutletVelocity do that ?

No, it will compute velocity at each timestep. You can't fix both velocity and pressure anyway.