Provides several methods to convert an input pressure field into derived forms, including: More...

Inheritance diagram for pressure:

Collaboration diagram for pressure:

Public Types
enum	mode : unsigned { STATIC = (1 << 0), TOTAL = (1 << 1), ISENTROPIC = (1 << 2), COEFF = (1 << 3), STATIC_COEFF = (STATIC \| COEFF), TOTAL_COEFF = (TOTAL \| COEFF) }
	Enumeration for pressure calculation mode. More...

enum	hydrostaticMode : unsigned { NONE = 0, ADD, SUBTRACT }
	Enumeration for hydrostatic contributions. More...

Public Member Functions
	TypeName ("pressure")
	Runtime type information. More...

	pressure (const word &name, const Time &runTime, const dictionary &)
	Construct from Time and dictionary. More...

	pressure (const pressure &)=delete
	No copy construct. More...

void	operator= (const pressure &)=delete
	No copy assignment. More...

virtual	~pressure ()=default
	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 &fieldName=word::null, const word &resultName=word::null)
	Construct from Time and dictionary. More...

	fieldExpression (const fieldExpression &)=delete
	No copy construct. More...

void	operator= (const fieldExpression &)=delete
	No copy assignment. More...

virtual	~fieldExpression ()=default
	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...

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...

virtual	~fvMeshFunctionObject ()=default
	Destructor. 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...

virtual	~regionFunctionObject ()=default
	Destructor. More...

template<class ObjectType >
const ObjectType *	lookupObjectPtr (const word &fieldName) const
	Deprecated(2018-10) More...

template<class ObjectType >
ObjectType *	lookupObjectRefPtr (const word &fieldName) const
	Deprecated(2018-10) More...

Public Member Functions inherited from stateFunctionObject
	stateFunctionObject (const word &name, const Time &runTime)
	Construct from components. More...

virtual	~stateFunctionObject ()=default
	Destructor. More...

dictionary &	propertyDict ()
	Return access to the property dictionary. More...

bool	foundProperty (const word &entryName) const
	Return true if the property exists. More...

void	clearTrigger ()
	Remove the trigger index from the properties. More...

label	getTrigger () const
	Get the current trigger index. More...

bool	setTrigger (const label triggeri, bool increaseOnly=true)
	Set the trigger index. Normally only if greater than current. More...

bool	getDict (const word &entryName, dictionary &dict) const
	Set dictionary, return true if set. More...

bool	getObjectDict (const word &objectName, const word &entryName, dictionary &dict) const
	Set dictionary from named object, return true if set. More...

template<class Type >
Type	getProperty (const word &entryName, const Type &defaultValue=Type(Zero)) const
	Retrieve generic property. More...

template<class Type >
bool	getProperty (const word &entryName, Type &value) const
	Set generic property, return true if set. More...

template<class Type >
void	setProperty (const word &entryName, const Type &value)
	Add generic property. More...

template<class Type >
Type	getObjectProperty (const word &objectName, const word &entryName, const Type &defaultValue=Type(Zero)) const
	Retrieve generic property from named object. More...

template<class Type >
bool	getObjectProperty (const word &objectName, const word &entryName, Type &value) const
	Set generic property from named object, return true if set. More...

template<class Type >
void	setObjectProperty (const word &objectName, const word &entryName, const Type &value)
	Add generic property from named object. More...

template<class Type >
void	setResult (const word &entryName, const Type &value)
	Add result. More...

template<class Type >
void	setObjectResult (const word &objectName, const word &entryName, const Type &value)
	Add result from named object. More...

template<class Type >
Type	getResult (const word &entryName, const Type &defaultValue=Type(Zero)) const
	Retrieve result. More...

template<class Type >
Type	getObjectResult (const word &objectName, const word &entryName, const Type &defaultValue=Type(Zero)) const
	Retrieve result from named object. More...

template<class Type >
bool	getObjectResult (const word &objectName, const word &entryName, Type &value) const
	Set result from named object, return true if set. More...

word	resultType (const word &entryName) const
	Retrieve the result type. More...

word	objectResultType (const word &objectName, const word &entryName) const
	Return the type of result. More...

wordList	objectResultEntries () const
	Retrieve the result entries. More...

wordList	objectResultEntries (const word &objectName) const
	Return result entries for named object. More...

void	writeResultEntries (Ostream &os) const
	Write the results entries for all objects to stream. More...

void	writeResultEntries (const word &objectName, Ostream &os) const
	Write the results entries for named object to stream. More...

void	writeAllResultEntries (Ostream &os) const
	Write the results entries for all objects to stream. More...

Public Member Functions inherited from timeFunctionObject
	timeFunctionObject (const word &name, const Time &runTime)
	Construct from Time. More...

virtual	~timeFunctionObject ()=default
	Destructor. More...

const Time &	time () const
	Return time database. More...

objectRegistry &	storedObjects ()

const objectRegistry &	storedObjects () const

Public Member Functions inherited from functionObject
	declareRunTimeSelectionTable (autoPtr, functionObject, dictionary,(const word &name, const Time &runTime, const dictionary &dict),(name, runTime, dict))

	functionObject (const word &name, const bool withNamePrefix=defaultUseNamePrefix)
	Construct from components. More...

autoPtr< functionObject >	clone () const
	Return clone. More...

virtual	~functionObject ()=default
	Destructor. More...

virtual const word &	type () const =0
	Runtime type information. More...

const word &	name () const noexcept
	Return the name of this functionObject. More...

bool	useNamePrefix () const noexcept
	Return the flag for adding a scoping name prefix. More...

bool	useNamePrefix (bool on) noexcept
	Modify the flag for adding a scoping name prefix. More...

virtual bool	execute (const label subIndex)
	Execute using the specified subIndex. More...

virtual bool	end ()
	Called when Time::run() determines that the time-loop exits. More...

virtual bool	adjustTimeStep ()
	Called at the end of Time::adjustDeltaT() if adjustTime is true. More...

virtual bool	filesModified () const
	Did any file get changed during execution? 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...

Static Public Attributes
static const Enum< mode >	modeNames

static const Enum< hydrostaticMode >	hydrostaticModeNames

Static Public Attributes inherited from functionObject
static int	debug
	Flag to execute debug content. More...

static bool	postProcess
	Global post-processing mode switch. More...

static bool	defaultUseNamePrefix
	Global default for useNamePrefix. More...

static word	outputPrefix
	Directory prefix. More...

Additional Inherited Members
Static Public Member Functions inherited from functionObject
static autoPtr< functionObject >	New (const word &name, const Time &runTime, const dictionary &dict)
	Select from dictionary, based on its "type" entry. More...

Public Attributes inherited from functionObject
bool	log
	Flag to write log into Info. More...

Protected Member Functions inherited from fieldExpression
void	setResultName (const word &typeName, const word &defaultArg)
	Set the name of result field. More...

template<class Type >
bool	foundObject (const word &name, const bool verbose=true) const
	Return true if required objects are found. More...

Protected Member Functions inherited from fvMeshFunctionObject
	fvMeshFunctionObject (const fvMeshFunctionObject &)=delete
	No copy construct. More...

void	operator= (const fvMeshFunctionObject &)=delete
	No copy assignment. More...

Protected Member Functions inherited from regionFunctionObject
virtual const objectRegistry &	obr () const
	The region or sub-region registry being used. More...

template<class ObjectType >
bool	foundObject (const word &fieldName) const
	Find object (eg, a field) in the (sub) objectRegistry. More...

template<class ObjectType >
const ObjectType *	cfindObject (const word &fieldName) const

template<class ObjectType >
const ObjectType *	findObject (const word &fieldName) const

template<class ObjectType >
ObjectType *	findObject (const word &fieldName)

template<class ObjectType >
ObjectType *	getObjectPtr (const word &fieldName) const

template<class ObjectType >
const ObjectType &	lookupObject (const word &fieldName) const
	Lookup and return object (eg, a field) from the (sub) objectRegistry. More...

template<class ObjectType >
ObjectType &	lookupObjectRef (const word &fieldName) const
	Lookup and return object (eg, a field) from the (sub) objectRegistry. More...

template<class ObjectType >
bool	store (word &fieldName, const tmp< ObjectType > &tfield, bool cacheable=false)
	Store the field in the (sub) objectRegistry under the given name. More...

template<class ObjectType >
bool	storeInDb (const word &fieldName, const tmp< ObjectType > &tfield, const objectRegistry &obr)
	Store the field in an optional objectRegistry under the given name. More...

bool	writeObject (const word &fieldName)
	Write field if present in the (sub) objectRegistry. More...

bool	clearObject (const word &fieldName)
	Clear field from the (sub) objectRegistry if present. More...

void	clearObjects (const wordList &objNames)
	Clear fields from the (sub) objectRegistry if present. More...

	regionFunctionObject (const regionFunctionObject &)=delete
	No copy construct. More...

void	operator= (const regionFunctionObject &)=delete
	No copy assignment. More...

Protected Member Functions inherited from stateFunctionObject
const functionObjects::properties &	stateDict () const
	Return a const reference to the state dictionary. More...

functionObjects::properties &	stateDict ()
	Return non-const access to the state dictionary. More...

	stateFunctionObject (const stateFunctionObject &)=delete
	No copy construct. More...

void	operator= (const stateFunctionObject &)=delete
	No copy assignment. More...

Protected Member Functions inherited from timeFunctionObject
void	clearOutputObjects (const wordList &objNames)
	Remove specified items from "functionObjectObjects". More...

	timeFunctionObject (const timeFunctionObject &)=delete
	No copy construct. More...

void	operator= (const timeFunctionObject &)=delete
	No copy assignment. More...

Protected Member Functions inherited from functionObject
word	scopedName (const word &name) const
	Return a scoped (prefixed) name. More...

Protected Attributes inherited from fieldExpression
word	fieldName_
	Name of field to process. More...

word	resultName_
	Name of result field. More...

autoPtr< Detail::zoneSubSet >	zoneSubSetPtr_
	Sub-set mesh. More...

Protected Attributes inherited from fvMeshFunctionObject
const fvMesh &	mesh_
	Reference to the fvMesh. More...

Protected Attributes inherited from regionFunctionObject
word	subRegistryName_
	Name for alternative object registry. More...

const objectRegistry &	obr_
	Reference to the region objectRegistry. More...

const objectRegistry *	obrPtr_
	Pointer to alternative (eg, sub-region) objectRegistry. More...

Protected Attributes inherited from timeFunctionObject
const Time &	time_
	Reference to the time database. More...

Detailed Description

Provides several methods to convert an input pressure field into derived forms, including:

- static pressure

\[ p_s = p_{ref} + \rho p_k \]

total pressure
\[ p_0 = p_{ref} + p + 0.5 \rho |\vec U|^2 \]
isentropic pressure
\[ p_i = p*(1 + ((\gamma-1)*M^2)/2)^{(\gamma/(\gamma - 1))} \]
static pressure coefficient
\[ Cp = \frac{p_s - p_{\inf}}{0.5 \rho_{\inf} |\vec U_{\inf}|^2} \]
total pressure coefficient
\[ Cp_0 = \frac{p_0 - p_{\inf}}{0.5 \rho_{\inf} |\vec U_{\inf}|^2} \]

where

$ \rho $	=	Density [kg/m3]
$ \vec U $	=	Velocity [m/s]
$ \rho_{\inf} $	=	Freestream density [kg/m3]
$ p_{\inf} $	=	Freestream pressure [Pa]
$ U_{\inf} $	=	Freestream velocity [m/s]
$ p_k $	=	Kinematic pressure (p/rho)[m2/s2]
$ p_s $	=	Static pressure [Pa]
$ p_0 $	=	Total pressure [Pa]
$ p_{ref} $	=	Reference pressure level [Pa]
$ p_i $	=	Total isentropic pressure
$ Cp $	=	Pressure coefficient
$ Cp_0 $	=	Total pressure coefficient
$ \gamma $	=	Specific heat ratio

The function object will operate on both kinematic ( $ p_k $) and static pressure ( $ p $) fields.

Operands:

Operand	Type	Location
`input`	volScalarField	$FOAM_CASE/<time>/<inpField>
`output` file	-	-
`output` field	volScalarField	$FOAM_CASE/<time>/<outField>

Usage

Minimal example by using system/controlDict.functions:

pressure1
{
    // Mandatory entries (unmodifiable)
    type            pressure;
    libs            (fieldFunctionObjects);

    // Mandatory entries (runtime modifiable)
    mode            \<option\>;

    // Optional entries (runtime modifiable)
    field           \<pName\>;
    U               \<UName\>;
    rho             <rhoName>;
    rhoInf          1.0; // enabled if rho=rhoInf
    pRef            0.0;
    hydroStaticMode none;
    g               (0 -9.81 0); // enabled if hydroStaticMode != none
    hRef            0.0;         // enabled if hydroStaticMode != none
    pInf            0.0;
    UInf            (1 0 0);

    // Optional (inherited) entries
    ...
}

where the entries mean:

Property	Description	Type	Req'd	Dflt
`type`	Type name: pressure	word	yes	-
`libs`	Library name: fieldFunctionObjects	word	yes	-
`mode`	Calculation mode (see below)	word	yes	-
`field`	Name of the pressure field	word	no	p
`U`	Name of the velocity field	word	no	U
`rho`	Name of the density field	word	no	rho
`rhoInf`	Freestream density for coefficient calculation	scalar	conditional	-
`pRef`	Reference pressure for total pressure	scalar	no	0
`hydrostaticMode`	Hydrostatic contributions (see below)	word	no	none
`g`	Gravity vector (see below)	vector	no	-
`hRef`	Reference height (see below)	scalar	no	-
`pInf`	Freestream pressure for coefficient calculation	scalar	no	-
`UInf`	Freestream velocity for coefficient calculation	vector	no	-

Options for the mode entry:

        static      | static pressure
        total       | total pressure
        isentropic  | isentropic pressure
        staticCoeff | static pressure coefficient
        totalCoeff  | total pressure coefficient

The optional hydrostaticMode entry provides handling for the term $ \rho (\vec{g} \dot \vec{h})$ where options include

        none     | not included
        add      | add the term, e.g. to convert from p_rgh to p
        subtract | subtract the term, e.g. to convert from p to p_rgh

If the hydrostaticMode is active, values are also required for gravity, g, and reference height, hRef. By default these will be retrieved from the database. When these values are not available the user must provide them, e.g.

        g           (0 -9.81 0);
        hRef        0;

The inherited entries are elaborated in:

Usage by the postProcess utility is not available.

See also

Foam::functionObject
Foam::functionObjects::fieldExpression
Foam::functionObjects::fvMeshFunctionObject
ExtendedCodeGuide::functionObjects::field::pressure

Source files

Definition at line 349 of file pressure.H.

Member Enumeration Documentation

◆ mode

enum mode : unsigned

Enumeration for pressure calculation mode.

Enumerator
STATIC	Static pressure.
TOTAL	Total pressure.
ISENTROPIC	Isentropic pressure.
COEFF	Coefficient manipulator.
STATIC_COEFF
TOTAL_COEFF

Definition at line 358 of file pressure.H.

◆ hydrostaticMode

enum hydrostaticMode : unsigned

Enumeration for hydrostatic contributions.

Enumerator
NONE
ADD
SUBTRACT

Definition at line 371 of file pressure.H.

Constructor & Destructor Documentation

◆ pressure() [1/2]

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

Construct from Time and dictionary.

Definition at line 350 of file pressure.C.

References dict, and Foam::read().

Here is the call graph for this function:

◆ pressure() [2/2]

pressure ( const pressure & )

delete

No copy construct.

◆ ~pressure()

virtual ~pressure ( )

virtualdefault

Destructor.

Member Function Documentation

◆ TypeName()

TypeName ( "pressure" )

Runtime type information.

◆ operator=()

void operator= ( const pressure & )

delete

No copy assignment.

◆ read()

bool read ( const dictionary & dict )

virtual

Read the pressure data.

Reimplemented from fieldExpression.

Definition at line 377 of file pressure.C.

References dict, Foam::endl(), Foam::Info, Foam::mag(), Foam::magSqr(), Foam::name(), Foam::nl, fieldExpression::read(), Foam::type(), and WarningInFunction.

Here is the call graph for this function:

Member Data Documentation

◆ modeNames

const Foam::Enum< Foam::functionObjects::pressure::mode > modeNames

static

Definition at line 368 of file pressure.H.

◆ hydrostaticModeNames

const Foam::Enum< Foam::functionObjects::pressure::hydrostaticMode > hydrostaticModeNames