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pressure Class Reference

Includes tools to manipulate the pressure into different forms. More...

Inheritance diagram for pressure:
Collaboration diagram for pressure:

Public Member Functions

 TypeName ("pressure")
 Runtime type information. More...
 
 pressure (const word &name, const Time &runTime, const dictionary &)
 Construct from Time and dictionary. More...
 
virtual ~pressure ()
 Destructor. More...
 
virtual bool read (const dictionary &)
 Read the pressure data. More...
 
- Public Member Functions inherited from fieldExpression
 TypeName ("fieldExpression")
 Runtime type information. More...
 
 fieldExpression (const word &name, const Time &runTime, const dictionary &dict, const word &functionName, const word &defaultFieldName=word::null)
 Construct from Time and dictionary. More...
 
 fieldExpression (const fieldExpression &)=delete
 Disallow default bitwise copy construction. More...
 
virtual ~fieldExpression ()
 Destructor. More...
 
virtual bool execute ()
 Calculate the result field. More...
 
virtual bool write ()
 Write the result field. More...
 
virtual bool clear ()
 Clear the result field from the objectRegistry. More...
 
void operator= (const fieldExpression &)=delete
 Disallow default bitwise assignment. More...
 
- Public Member Functions inherited from fvMeshFunctionObject
 TypeName ("fvMeshFunctionObject")
 Runtime type information. More...
 
 fvMeshFunctionObject (const word &name, const Time &runTime, const dictionary &dict)
 Construct from Time and dictionary. More...
 
 fvMeshFunctionObject (const word &name, const objectRegistry &obr, const dictionary &dict)
 Construct from the region objectRegistry and dictionary. More...
 
 fvMeshFunctionObject (const fvMeshFunctionObject &)=delete
 Disallow default bitwise copy construction. More...
 
virtual ~fvMeshFunctionObject ()
 Destructor. More...
 
void operator= (const fvMeshFunctionObject &)=delete
 Disallow default bitwise assignment. More...
 
- Public Member Functions inherited from regionFunctionObject
 TypeName ("regionFunctionObject")
 Runtime type information. More...
 
 regionFunctionObject (const word &name, const Time &runTime, const dictionary &dict)
 Construct from Time and dictionary. More...
 
 regionFunctionObject (const word &name, const objectRegistry &obr, const dictionary &dict)
 Construct from the region objectRegistry and dictionary. More...
 
 regionFunctionObject (const regionFunctionObject &)=delete
 Disallow default bitwise copy construction. More...
 
virtual ~regionFunctionObject ()
 Destructor. More...
 
void operator= (const regionFunctionObject &)=delete
 Disallow default bitwise assignment. More...
 
- Public Member Functions inherited from functionObject
 ClassName ("functionObject")
 
virtual const wordtype () const =0
 Runtime type information. More...
 
 declareRunTimeSelectionTable (autoPtr, functionObject, dictionary,(const word &name, const Time &runTime, const dictionary &dict),(name, runTime, dict))
 
 functionObject (const word &name)
 Construct from components. More...
 
autoPtr< functionObjectclone () const
 Return clone. More...
 
 functionObject (const functionObject &)=delete
 Disallow default bitwise copy construction. More...
 
virtual ~functionObject ()
 Destructor. More...
 
const wordname () const
 Return the name of this functionObject. More...
 
virtual bool executeAtStart () const
 Return true if the functionObject should be executed at the start. More...
 
virtual bool end ()
 Called when Time::run() determines that the time-loop exits. More...
 
virtual bool setTimeStep ()
 Called by Time::setDeltaT(). Allows the functionObject to override. More...
 
virtual scalar timeToNextWrite ()
 Called by Time::adjustTimeStep(). Allows the functionObject to. More...
 
virtual void updateMesh (const mapPolyMesh &mpm)
 Update for changes of mesh. More...
 
virtual void movePoints (const polyMesh &mesh)
 Update for changes of mesh. More...
 
void operator= (const functionObject &)=delete
 Disallow default bitwise assignment. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from functionObject
static autoPtr< functionObjectNew (const word &name, const Time &, const dictionary &)
 Select from dictionary, based on its "type" entry. More...
 
- Public Attributes inherited from functionObject
Switch log
 Switch write log to Info. More...
 
Switch executeAtStart_
 Switch write log to Info. More...
 
- Static Public Attributes inherited from functionObject
static bool postProcess
 Global post-processing mode switch. More...
 
- Protected Member Functions inherited from fieldExpression
template<class Type >
bool foundObject (const word &name)
 
- Protected Member Functions inherited from regionFunctionObject
template<class ObjectType >
bool foundObject (const word &fieldName) const
 Find field in the objectRegistry. More...
 
template<class ObjectType >
const ObjectType & lookupObject (const word &fieldName) const
 Lookup object from the objectRegistry. More...
 
template<class ObjectType >
ObjectType & lookupObjectRef (const word &fieldName)
 Lookup non-const object reference from the objectRegistry. More...
 
template<class ObjectType >
bool store (const tmp< ObjectType > &tfield)
 Store the given field in the objectRegistry. More...
 
template<class ObjectType >
bool store (const word &fieldName, const tmp< ObjectType > &tfield, bool cacheable=false)
 Store the given field in the objectRegistry under the given name. More...
 
bool writeObject (const word &fieldName)
 Write field if present in objectRegistry. More...
 
bool clearObject (const word &fieldName)
 Clear field from the objectRegistry if present. More...
 
- Protected Attributes inherited from fieldExpression
const word fieldName_
 Name of field to process. More...
 
word resultName_
 Name of result field. More...
 
- Protected Attributes inherited from fvMeshFunctionObject
const fvMeshmesh_
 Reference to the fvMesh. More...
 
- Protected Attributes inherited from regionFunctionObject
const Timetime_
 Reference to the Time. More...
 
const objectRegistryobr_
 Reference to the region objectRegistry. More...
 

Detailed Description

Includes tools to manipulate the pressure into different forms.

These currently include:

  • static pressure

    \[ p = \rho p_k \]

  • total pressure

    \[ p_0 = p_{ref} + p + 0.5 \rho |U|^2 \]

  • static pressure coefficient

    \[ Cp = \frac{p - p_{\inf}}{0.5 \rho_{\inf} |U_{\inf}|^2} \]

  • total pressure coefficient

    \[ Cp_0 = \frac{p_0 - p_{\inf}}{0.5 \rho_{\inf} |U_{\inf}|^2} \]

where

$ \rho $ = Density [kg/m^3]
$ U $ = Velocity [m/s]
$ \rho_{\inf} $ = Freestream density [kg/m^3]
$ p_{\inf} $ = Freestream pressure [Pa]
$ U_{\inf} $ = Freestream velocity [m/s]
$ p_k $ = Kinematic pressure (p/rho) [m^2/s^2]
$ p $ = Pressure [Pa]
$ p_0 $ = Total pressure [Pa]
$ p_{ref} $ = Reference pressure level [Pa]
$ Cp $ = Pressure coefficient
$ Cp_0 $ = Total pressure coefficient

The function object will operate on both kinematic ( $ p_k $) and static pressure ( $ p $) fields, and the result is written as a volScalarField.

The modes of operation are:

Mode calcTotal calcCoeff
Static pressure no no
Total pressure yes no
Pressure coefficient no yes
Total pressure coefficient yes yes

Example of function object specification to calculate pressure coefficient:

    pressure1
    {
        type        pressure;
        libs        ("libfieldFunctionObjects.so");
        ...
        calcTotal   no;
        calcCoeff   yes;
    }
Usage
Property Description Required Default value
type type name: pressure yes
field Name of the pressure field no p
U Name of the velocity field no U
rho Name of the density field no rho
result Name of the resulting field no derived from p
calcTotal Calculate total coefficient yes
pRef Reference pressure for total pressure no 0
calcCoeff Calculate pressure coefficient yes
pInf Freestream pressure for coefficient calculation no
UInf Freestream velocity for coefficient calculation no
rhoInf Freestream density for coefficient calculation no
See also
Foam::functionObjects::fieldExpression Foam::functionObjects::fvMeshFunctionObject
Source files

Definition at line 254 of file pressure.H.

Constructor & Destructor Documentation

◆ pressure()

pressure ( const word name,
const Time runTime,
const dictionary dict 
)

Construct from Time and dictionary.

Definition at line 186 of file pressure.C.

References Foam::dimPressure, and Foam::read().

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◆ ~pressure()

~pressure ( )
virtual

Destructor.

Definition at line 215 of file pressure.C.

Member Function Documentation

◆ TypeName()

TypeName ( "pressure"  )

Runtime type information.

◆ read()

bool read ( const dictionary dict)
virtual

Read the pressure data.

Reimplemented from fieldExpression.

Definition at line 221 of file pressure.C.

References Foam::endl(), dictionary::lookup(), dictionary::lookupOrDefault(), Foam::mag(), Foam::magSqr(), Foam::name(), dictionary::readIfPresent(), Foam::type(), and WarningInFunction.

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The documentation for this class was generated from the following files: