porousBafflePressure

Description

The porousBafflePressure is boundary condition that provides a jump condition, using the cyclic condition as a base.

The porous baffle introduces a pressure jump defined by:

$$\Delta p = -(D \mu U + 0.5 I \rho |U|^2 )L$$

where:

Property	Description
$p$	Pressure [Pa]
$\rho$	Density [kg/m^3]
$\mu$	Laminar viscosity [Pa s]
$D$	Darcy coefficient
$I$	Inertial coefficient
$L$	Porous media length in the flow direction

Usage

The condition requires entries in both the boundary and field files.

Boundary file

<patchName>
{
    type            wall;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            porousBafflePressure;
    D               <Function1<scalar>>;
    I               <Function1<scalar>>;
    length          <scalar>;

    // Optional entries
    phi             <word>;
    rho             <word>;
    uniformJump     <bool>;

    // Inherited entries
    patchType       cyclic;
    jump            uniform 0;
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: porousBafflePressure	word	yes	-
D	Darcy coefficient	Function1<scalar>	yes	-
I	Inertial coefficient	Function1<scalar>	yes	-
length	Porous media length in the flow direction	scalar	yes	-
uniformJump	Flag to apply a uniform pressure drop on the patch based	bool	no	false
phi	Name of flux field	word	no	phi
rho	Name of density field	word	no	rho
patchType	Underlying patch type should be cyclic	word	yes	-
jump	Jump value	scalarField	yes	-

The inherited entries are elaborated in:

• fixedJumpFvPatchField.H
• PatchFunction1.H

Further information

Tutorial:

• damBreakPorousBaffle

Source code:

• porousBafflePressure

API:

• Foam::porousBafflePressureFvPatchField

History: Introduced in version 2.2.2