noiseFFT Class Reference

FFT of the pressure field. More...

Inheritance diagram for noiseFFT:
Collaboration diagram for noiseFFT:

Public Member Functions

 noiseFFT (const scalar deltat, const scalarField &pressure)
 Construct from pressure field. More...
 
 noiseFFT (Istream &)
 Construct from Istream. More...
 
 noiseFFT (const fileName &pFileName, const label skip=0)
 Construct from pressure field file name. More...
 
Pair< scalarFieldpt () const
 Return p(t) More...
 
tmp< scalarFieldwindow (const label N, const label n) const
 Return the nth window. More...
 
tmp< scalarFieldHanning (const label N) const
 Return the Hanning window function. More...
 
tmp< scalarFieldPf (const tmp< scalarField > &pn) const
 Return the fft of the given pressure data. More...
 
Pair< scalarFieldmeanPf (const label N, const label nw) const
 Return the multi-window mean fft of the complete pressure data. More...
 
Pair< scalarFieldRMSmeanPf (const label N, const label nw) const
 Return the multi-window RMS mean fft of the complete pressure data. More...
 
Pair< scalarFieldLf (const Pair< scalarField > &gPf) const
 Return the narrow-band PFL (pressure-fluctuation level) spectrum. More...
 
Pair< scalarFieldLdelta (const Pair< scalarField > &gLf, const scalar f1, const scalar fU) const
 Return the one-third-octave-band PFL spectrum. More...
 
Pair< scalarFieldPdelta (const Pair< scalarField > &gLf, const scalar f1, const scalar fU) const
 Return the one-third-octave-band pressure spectrum. More...
 
scalar Lsum (const Pair< scalarField > &gLf) const
 Return the total PFL as the sum of Lf over all frequencies. More...
 
scalar dbToPa (const scalar db) const
 Convert the db into Pa. More...
 
tmp< scalarFielddbToPa (const tmp< scalarField > &db) const
 Convert the db-field into Pa. More...
 
- Public Member Functions inherited from Field< scalar >
 Field ()
 Construct null. More...
 
 Field (const label)
 Construct given size. More...
 
 Field (const label, const scalar &)
 Construct given size and initial value. More...
 
 Field (const label, const zero)
 Construct given size and initialised to zero. More...
 
 Field (const UList< scalar > &)
 Copy constructor of a UList<Type> More...
 
 Field (List< scalar > &&)
 Mover constructor transferring the List contents. More...
 
 Field (const UIndirectList< scalar > &)
 Copy constructor of a UIndirectList<Type> More...
 
 Field (const Field< scalar > &)
 Copy constructor. More...
 
 Field (Field< scalar > &, bool reuse)
 Copy constructor or reuse as specified. More...
 
 Field (Field< scalar > &&)
 Move constructor transferring the Field contents. More...
 
 Field (const tmp< Field< scalar >> &)
 Copy constructor of tmp<Field> More...
 
 Field (const UList< scalar > &mapF, const labelUList &mapAddressing)
 Construct by 1 to 1 mapping from the given field. More...
 
 Field (const tmp< Field< scalar >> &tmapF, const labelUList &mapAddressing)
 Construct by 1 to 1 mapping from the given tmp field. More...
 
 Field (const UList< scalar > &mapF, const labelListList &mapAddressing, const scalarListList &weights)
 Construct by interpolative mapping from the given field. More...
 
 Field (const tmp< Field< scalar >> &tmapF, const labelListList &mapAddressing, const scalarListList &weights)
 Construct by interpolative mapping from the given tmp field. More...
 
 Field (Istream &)
 Construct from Istream. More...
 
 Field (const word &keyword, const dictionary &, const label size)
 Construct from a dictionary entry. More...
 
 Field (const word &keyword, const unitConversion &, const dictionary &, const label size)
 Construct from a dictionary entry with unit conversion. More...
 
tmp< Field< scalar > > clone () const
 Clone. More...
 
void map (const UList< scalar > &mapF, const labelUList &mapAddressing)
 1 to 1 map from the given field More...
 
void map (const tmp< Field< scalar >> &tmapF, const labelUList &mapAddressing)
 1 to 1 map from the given tmp field More...
 
void map (const UList< scalar > &mapF, const labelListList &mapAddressing, const scalarListList &weights)
 Interpolative map from the given field. More...
 
void map (const tmp< Field< scalar >> &tmapF, const labelListList &mapAddressing, const scalarListList &weights)
 Interpolative map from the given tmp field. More...
 
void rmap (const UList< scalar > &mapF, const labelUList &mapAddressing)
 1 to 1 reverse-map from the given field More...
 
void rmap (const tmp< Field< scalar >> &tmapF, const labelUList &mapAddressing)
 1 to 1 reverse-map from the given tmp field More...
 
void rmap (const UList< scalar > &mapF, const labelUList &mapAddressing, const UList< scalar > &weights)
 Interpolative reverse map from the given field. More...
 
void rmap (const tmp< Field< scalar >> &tmapF, const labelUList &mapAddressing, const UList< scalar > &weights)
 Interpolative reverse map from the given tmp field. More...
 
void reset (const Field< scalar > &)
 Reset the field values to the given field. More...
 
void negate ()
 Negate this field. More...
 
tmp< Field< cmptType > > component (const direction) const
 Return a component field of the field. More...
 
void replace (const direction, const UList< cmptType > &)
 Replace a component field of the field. More...
 
void replace (const direction, const tmp< Field< cmptType >> &)
 Replace a component field of the field. More...
 
void replace (const direction, const cmptType &)
 Replace a component field of the field. More...
 
VSForm block (const label start) const
 
tmp< Field< scalar > > T () const
 Return the field transpose (only defined for second rank tensors) More...
 
void operator= (const Field< scalar > &)
 
void operator= (Field< scalar > &&)
 
void operator= (const UList< scalar > &)
 
void operator= (List< scalar > &&)
 
void operator= (const SubField< scalar > &)
 
void operator= (const tmp< Field< scalar >> &)
 
void operator= (const scalar &)
 
void operator= (const zero)
 
void operator= (const VectorSpace< Form, Cmpt, nCmpt > &)
 
void operator= (const tmp< Field > &rhs)
 
void operator+= (const UList< scalar > &)
 
void operator+= (const tmp< Field< scalar >> &)
 
void operator+= (const scalar &)
 
void operator-= (const UList< scalar > &)
 
void operator-= (const tmp< Field< scalar >> &)
 
void operator-= (const scalar &)
 
void operator*= (const UList< scalar > &)
 
void operator*= (const tmp< Field< scalar >> &)
 
void operator*= (const scalar &)
 
void operator/= (const UList< scalar > &)
 
void operator/= (const tmp< Field< scalar >> &)
 
void operator/= (const scalar &)
 
- Public Member Functions inherited from refCount
int count () const
 Return the current reference count. More...
 
bool unique () const
 Return true if the reference count is zero. More...
 
void operator++ ()
 Increment the reference count. More...
 
void operator++ (int)
 Increment the reference count. More...
 
void operator-- ()
 Decrement the reference count. More...
 
void operator-- (int)
 Decrement the reference count. More...
 
void operator= (const refCount &)=delete
 Disallow bitwise assignment. More...
 
- Public Member Functions inherited from List< scalar >
 List ()
 Null constructor. More...
 
 List (const label)
 Construct with given size. More...
 
 List (const label, const scalar &)
 Construct with given size and value for all elements. More...
 
 List (const label, const zero)
 Construct with given size initialising all elements to zero. More...
 
 List (const List< scalar > &)
 Copy constructor. More...
 
 List (const UList< T2 > &)
 Copy constructor from list containing another type. More...
 
 List (List< scalar > &&)
 Move constructor. More...
 
 List (List< scalar > &, bool reuse)
 Construct as copy or reuse as specified. More...
 
 List (const UList< scalar > &, const labelUList &mapAddressing)
 Construct as subset. More...
 
 List (InputIterator first, InputIterator last)
 Construct given start and end iterators. More...
 
 List (const FixedList< scalar, Size > &)
 Construct as copy of FixedList<T, Size> More...
 
 List (const PtrList< scalar > &)
 Construct as copy of PtrList<T> More...
 
 List (const SLList< scalar > &)
 Construct as copy of SLList<T> More...
 
 List (const UIndirectList< scalar > &)
 Construct as copy of UIndirectList<T> More...
 
 List (const BiIndirectList< scalar > &)
 Construct as copy of BiIndirectList<T> More...
 
 List (std::initializer_list< scalar >)
 Construct from an initialiser list. More...
 
 List (Istream &)
 Construct from Istream. More...
 
label size () const
 Return the number of elements in the UList. More...
 
autoPtr< List< scalar > > clone () const
 Clone. More...
 
 ~List ()
 Destructor. More...
 
void resize (const label)
 Alias for setSize(const label) More...
 
void resize (const label, const scalar &)
 Alias for setSize(const label, const T&) More...
 
void setSize (const label)
 Reset size of List. More...
 
void setSize (const label, const scalar &)
 Reset size of List and value for new elements. More...
 
void clear ()
 Clear the list, i.e. set size to zero. More...
 
void append (const scalar &)
 Append an element at the end of the list. More...
 
void append (const UList< scalar > &)
 Append a List at the end of this list. More...
 
void append (const UIndirectList< scalar > &)
 Append a UIndirectList at the end of this list. More...
 
void transfer (List< scalar > &)
 Transfer the contents of the argument List into this list. More...
 
void transfer (DynamicList< scalar, SizeInc, SizeMult, SizeDiv > &)
 Transfer the contents of the argument List into this list. More...
 
void transfer (SortableList< scalar > &)
 Transfer the contents of the argument List into this list. More...
 
scalar & newElmt (const label)
 Return subscript-checked element of UList. More...
 
void shallowCopy (const UList< scalar > &)=delete
 Disallow implicit shallowCopy. More...
 
void operator= (const UList< scalar > &)
 Assignment to UList operator. Takes linear time. More...
 
void operator= (const List< scalar > &)
 Assignment operator. Takes linear time. More...
 
void operator= (List< scalar > &&)
 Move assignment operator. More...
 
void operator= (const SLList< scalar > &)
 Assignment to SLList operator. Takes linear time. More...
 
void operator= (const UIndirectList< scalar > &)
 Assignment to UIndirectList operator. Takes linear time. More...
 
void operator= (const BiIndirectList< scalar > &)
 Assignment to BiIndirectList operator. Takes linear time. More...
 
void operator= (std::initializer_list< scalar >)
 Assignment to an initialiser list. More...
 
void operator= (const scalar &)
 Assignment of all entries to the given value. More...
 
void operator= (const zero)
 Assignment of all entries to zero. More...
 
- Public Member Functions inherited from UList< T >
 UList ()
 Null constructor. More...
 
 UList (T *__restrict__ v, label size)
 Construct from components. More...
 
 UList (const UList< T > &)=default
 Copy construct. More...
 
label fcIndex (const label i) const
 Return the forward circular index, i.e. the next index. More...
 
label rcIndex (const label i) const
 Return the reverse circular index, i.e. the previous index. More...
 
std::streamsize byteSize () const
 Return the binary size in number of characters of the UList. More...
 
const Tcdata () const
 Return a const pointer to the first data element,. More...
 
Tdata ()
 Return a pointer to the first data element,. More...
 
Tfirst ()
 Return the first element of the list. More...
 
const Tfirst () const
 Return first element of the list. More...
 
Tlast ()
 Return the last element of the list. More...
 
const Tlast () const
 Return the last element of the list. More...
 
void checkStart (const label start) const
 Check start is within valid range (0 ... size-1) More...
 
void checkSize (const label size) const
 Check size is within valid range (0 ... size) More...
 
void checkIndex (const label i) const
 Check index i is within valid range (0 ... size-1) More...
 
void shallowCopy (const UList< T > &)
 Copy the pointer held by the given UList. More...
 
void deepCopy (const UList< T > &)
 Copy elements of the given UList. More...
 
Toperator[] (const label)
 Return element of UList. More...
 
const Toperator[] (const label) const
 Return element of constant UList. More...
 
 operator const Foam::List< T > & () const
 Allow cast to a const List<T>&. More...
 
void operator= (const T &)
 Assignment of all entries to the given value. More...
 
void operator= (const zero)
 Assignment of all entries to zero. More...
 
iterator begin ()
 Return an iterator to begin traversing the UList. More...
 
iterator end ()
 Return an iterator to end traversing the UList. More...
 
const_iterator cbegin () const
 Return const_iterator to begin traversing the constant UList. More...
 
const_iterator cend () const
 Return const_iterator to end traversing the constant UList. More...
 
const_iterator begin () const
 Return const_iterator to begin traversing the constant UList. More...
 
const_iterator end () const
 Return const_iterator to end traversing the constant UList. More...
 
reverse_iterator rbegin ()
 Return reverse_iterator to begin reverse traversing the UList. More...
 
reverse_iterator rend ()
 Return reverse_iterator to end reverse traversing the UList. More...
 
const_reverse_iterator crbegin () const
 Return const_reverse_iterator to begin reverse traversing the UList. More...
 
const_reverse_iterator crend () const
 Return const_reverse_iterator to end reverse traversing the UList. More...
 
const_reverse_iterator rbegin () const
 Return const_reverse_iterator to begin reverse traversing the UList. More...
 
const_reverse_iterator rend () const
 Return const_reverse_iterator to end reverse traversing the UList. More...
 
label size () const
 Return the number of elements in the UList. More...
 
label max_size () const
 Return size of the largest possible UList. More...
 
bool empty () const
 Return true if the UList is empty (ie, size() is zero) More...
 
void swap (UList< T > &)
 Swap two ULists of the same type in constant time. More...
 
bool operator== (const UList< T > &) const
 Equality operation on ULists of the same type. More...
 
bool operator!= (const UList< T > &) const
 The opposite of the equality operation. Takes linear time. More...
 
bool operator< (const UList< T > &) const
 Compare two ULists lexicographically. Takes linear time. More...
 
bool operator> (const UList< T > &) const
 Compare two ULists lexicographically. Takes linear time. More...
 
bool operator<= (const UList< T > &) const
 Return true if !(a > b). Takes linear time. More...
 
bool operator>= (const UList< T > &) const
 Return true if !(a < b). Takes linear time. More...
 
const bool & operator[] (const label i) const
 

Static Public Attributes

static scalar p0 = 2e-5
 Reference pressure. More...
 
- Static Public Attributes inherited from Field< scalar >
static const char *const typeName
 

Additional Inherited Members

- Public Types inherited from Field< scalar >
typedef pTraits< scalar >::cmptType cmptType
 Component type. More...
 
typedef SubField< scalar > subField
 Declare type of subField. More...
 
- Public Types inherited from List< scalar >
typedef SubList< scalar > subList
 Declare type of subList. More...
 
- Public Types inherited from UList< T >
typedef T value_type
 Type of values the UList contains. More...
 
typedef Treference
 Type that can be used for storing into. More...
 
typedef const Tconst_reference
 Type that can be used for storing into. More...
 
typedef label difference_type
 The type that can represent the difference between any two. More...
 
typedef label size_type
 The type that can represent the size of a UList. More...
 
typedef Titerator
 Random access iterator for traversing UList. More...
 
typedef const Tconst_iterator
 Random access iterator for traversing UList. More...
 
typedef std::reverse_iterator< iteratorreverse_iterator
 Reverse iterator for reverse traversal of UList. More...
 
typedef std::reverse_iterator< const_iteratorconst_reverse_iterator
 Reverse iterator for reverse traversal of constant UList. More...
 
- Static Public Member Functions inherited from Field< scalar >
static const Field< scalar > & null ()
 Return a null field. More...
 
static tmp< Field< scalar > > NewCalculatedType (const Field< Type2 > &f)
 Return a pointer to a new calculatedFvPatchFieldField created on. More...
 
- Static Public Member Functions inherited from List< scalar >
static const List< scalar > & null ()
 Return a null List. More...
 
- Static Public Member Functions inherited from UList< T >
static const UList< T > & null ()
 Return a null UList. More...
 
- Protected Member Functions inherited from refCount
 refCount ()
 Construct null initialising count to 0. More...
 
 refCount (const refCount &)=delete
 Disallow copy. More...
 
- Protected Member Functions inherited from List< scalar >
void size (const label)
 Override size to be inconsistent with allocated storage. More...
 

Detailed Description

FFT of the pressure field.

Source files

Definition at line 48 of file noiseFFT.H.

Constructor & Destructor Documentation

◆ noiseFFT() [1/3]

noiseFFT ( const scalar  deltat,
const scalarField pressure 
)

Construct from pressure field.

Definition at line 40 of file noiseFFT.C.

◆ noiseFFT() [2/3]

noiseFFT ( Istream )

Construct from Istream.

◆ noiseFFT() [3/3]

noiseFFT ( const fileName pFileName,
const label  skip = 0 
)

Construct from pressure field file name.

Definition at line 51 of file noiseFFT.C.

References IOstream::eof(), Foam::exit(), Foam::FatalError, FatalErrorInFunction, IOstream::good(), List< T >::size(), Field< scalar >::T(), and List< scalar >::transfer().

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Member Function Documentation

◆ pt()

Foam::Pair< Foam::scalarField > pt ( ) const

Return p(t)

Definition at line 105 of file noiseFFT.C.

References forAll.

◆ window()

Foam::tmp< Foam::scalarField > window ( const label  N,
const label  n 
) const

Return the nth window.

Definition at line 117 of file noiseFFT.C.

References Foam::endl(), Foam::exit(), Foam::FatalError, FatalErrorInFunction, forAll, Foam::offset(), and tmp< T >::ref().

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◆ Hanning()

Foam::tmp< Foam::scalarField > Hanning ( const label  N) const

Return the Hanning window function.

Definition at line 149 of file noiseFFT.C.

References Foam::cos(), forAll, Foam::T(), and Foam::constant::mathematical::twoPi().

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◆ Pf()

Foam::tmp< Foam::scalarField > Pf ( const tmp< scalarField > &  pn) const

Return the fft of the given pressure data.

Definition at line 163 of file noiseFFT.C.

References tmp< T >::clear(), Foam::mag(), Foam::ReComplexField(), tmp< T >::ref(), fft::reverseTransform(), and Foam::sqrt().

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◆ meanPf()

Foam::Pair< Foam::scalarField > meanPf ( const label  N,
const label  nw 
) const

Return the multi-window mean fft of the complete pressure data.

Definition at line 198 of file noiseFFT.C.

References Foam::exit(), f(), Foam::FatalError, FatalErrorInFunction, forAll, Foam::nl, and List< T >::size().

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◆ RMSmeanPf()

Foam::Pair< Foam::scalarField > RMSmeanPf ( const label  N,
const label  nw 
) const

Return the multi-window RMS mean fft of the complete pressure data.

Definition at line 237 of file noiseFFT.C.

References Foam::endl(), Foam::exit(), f(), Foam::FatalError, FatalErrorInFunction, forAll, List< T >::size(), Foam::sqr(), and Foam::sqrt().

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◆ Lf()

Foam::Pair< Foam::scalarField > Lf ( const Pair< scalarField > &  gPf) const

Return the narrow-band PFL (pressure-fluctuation level) spectrum.

Definition at line 276 of file noiseFFT.C.

References Pair< Type >::first(), Foam::log10(), and Pair< Type >::second().

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◆ Ldelta()

Foam::Pair< Foam::scalarField > Ldelta ( const Pair< scalarField > &  gLf,
const scalar  f1,
const scalar  fU 
) const

Return the one-third-octave-band PFL spectrum.

starting at octave with mean frequency f1

Definition at line 285 of file noiseFFT.C.

References Foam::cbrt(), f(), Pair< Type >::first(), Foam::log10(), Foam::pow(), Pair< Type >::second(), List< T >::setSize(), List< T >::size(), and Foam::sqrt().

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◆ Pdelta()

Foam::Pair< Foam::scalarField > Pdelta ( const Pair< scalarField > &  gLf,
const scalar  f1,
const scalar  fU 
) const

Return the one-third-octave-band pressure spectrum.

starting at octave with mean frequency f1

Definition at line 334 of file noiseFFT.C.

References Foam::cbrt(), f(), Pair< Type >::first(), Pair< Type >::second(), List< T >::setSize(), List< T >::size(), Foam::sqr(), and Foam::sqrt().

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◆ Lsum()

Foam::scalar Lsum ( const Pair< scalarField > &  gLf) const

Return the total PFL as the sum of Lf over all frequencies.

Definition at line 383 of file noiseFFT.C.

References forAll, Foam::log10(), Foam::pow(), and Pair< Type >::second().

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◆ dbToPa() [1/2]

Foam::scalar dbToPa ( const scalar  db) const

Convert the db into Pa.

Definition at line 400 of file noiseFFT.C.

References Foam::pow().

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◆ dbToPa() [2/2]

Foam::tmp< Foam::scalarField > dbToPa ( const tmp< scalarField > &  db) const

Convert the db-field into Pa.

Definition at line 406 of file noiseFFT.C.

References Foam::pow().

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Member Data Documentation

◆ p0

Foam::scalar p0 = 2e-5
static

Reference pressure.

Definition at line 61 of file noiseFFT.H.


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