[jrsilvio_ver]

Hello guys, okay?
I would like to help with the definition of a boundary condition in particular.
I'm modeling a food oven and would like to define a condition of entry, much like the condition of total pressure, but do not know the pressure at the entrance and I have known and an average speed of 1 m / s. On output, have a negative pressure of 10 cm H2O and have no concrete information about the speed.
How could I set these boundary conditions? It would be reasonable to assume the output to the speed condition zeroGradient?
Could please exemplify the use of the boundary conditions.
I appreciate everyone's attention and a great weekend.

[jrsilvio_ver]

No one? Help there.

[jherb]

You could try the following
For input:
U: fixedMean
p: zeroGradient
For output:
U: zeroGradient (or inletOutlet)
p: fixedMean (or fixedValue)

Originally Posted by jrsilvio_ver

Hello guys, okay?
I would like to help with the definition of a boundary condition in particular.
I'm modeling a food oven and would like to define a condition of entry, much like the condition of total pressure, but do not know the pressure at the entrance and I have known and an average speed of 1 m / s. On output, have a negative pressure of 10 cm H2O and have no concrete information about the speed.
How could I set these boundary conditions? It would be reasonable to assume the output to the speed condition zeroGradient?
Could please exemplify the use of the boundary conditions.
I appreciate everyone's attention and a great weekend.

[jrsilvio_ver]

Under the conditions described above, could someone help me identify the errors?

__________________________________________________ _________________________
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 1 -1 0 0 0 0];

internalField uniform (0 0 0);

boundaryField
{
input
{
type outletInlet;
phi phi;
outletValue uniform (0 0 0);
value uniform (0 0 -1);
}

output
{
type zeroGradient;
}

burnertube
{
type fixedValue;
value uniform (0 0 0);
}

adiabaticwalls
{
type fixedValue;
value uniform (0 0 0);
}
}
__________________________________________________ _________________________

FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object T;
}

dimensions [0 0 0 1 0 0 0];

internalField uniform 0;

boundaryField
{
input
{
type fixedValue;
value uniform 300;
}

output
{
type zeroGradient;

}

adiabaticwalls
{
type zeroGradient; // Parede adiabática = sem fluxo de energia (calor)
}

burnertube
{
type fixedValue;
value uniform 1000;
}
}
__________________________________________________ _________________________

FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 2 -2 0 0 0 0];

internalField uniform 0;

boundaryField
{
adiabaticwalls
{
type zeroGradient;
}

burnertube
{
type zeroGradient;
}

input
{
type totalPressure;
U U;
phi phi;
rho none;
psi none;
gamma 1.37;
p0 uniform 189180.86;//101325/0.5356+0.5*(1)²
}

output
{
type totalPressure;
U U;
phi phi;
rho none;
psi none;
gamma 1.37;
p0 uniform 187349.27;//(101325-0.1*9810)/0.5356+0.5*(1)²
}
}

__________________________________________________ _________________________

I ran the simulation, but deltaT is on the order of 10 ^ -12.
Someone could help me?
I appreciate everyone's attention.