SRFVelocity

Description

The SRFVelocity is a boundary condition that provides a velocity condition to be used in conjunction with the single rotating frame (SRF) model (see: SRFModel class).

Given the free stream velocity in the absolute frame, the condition applies the appropriate rotation transformation in time and space to determine the local velocity.

The optional relative flag switches the behaviour of the patch such that:

• relative = yes: inlet velocity applied 'as is':

$$\u_p = \u_{in}$$

• relative = no : SRF velocity is subtracted from the inlet velocity:

$$\u_p = \u_{in} - \u_{p,srf}$$

where:

Property	Description
$\u_p$	Patch velocity [m/s]
$\u_{in}$	User-specified inlet velocity
$\u_{p,srf}$	SRF velocity

Usage

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

Boundary file

<patchName>
{
    type            patch;
    ...
}

Field file

<patchName>
{
    // Mandatory entries
    type            SRFVelocity;
    inletValue      <vectorField>;
    relative        <bool>;

    // Inherited entries;
    ...
}

where:

Property	Description	Type	Required	Default
type	Type name: SRFVelocity	word	yes	-
inletValue	Inlet velocity	vectorField	yes	-
relative	Flag to decide if the supplied inlet value relative to the SRF	bool	yes	-

The inherited entries are elaborated in:

• fixedValueFvPatchField.H

Further information

Tutorial:

• mixer

Source code:

• SRFVelocityFvPatchVectorField

API:

• Foam::SRFVelocityFvPatchVectorField

History: Introduced in version 1.5