Tasks for Special Purposes

Tasks that don't fit in one of the other categories.

writeVolumeSources

This task converts a block container into a volume source. The data is read from a Tecplot ASCII file and stored in the CGNS file.

In the Tecplot file there is a zone for each volume source with the same name. For each zone one data point is allowed only. Mass flow and temperature must be defined at least. Additionally a velocity vector can be set as well as values for the turbulent kinetic energy and the turbulent dissipation rate. In the auxiliary zone data the family name of the related block group must be stated as 'FamilyName'.

Usage

--writeVolumeSources/-wvs --cgnsFile/-cgns <CGNS file> --inputTecFile/-it <Tecplot ASCII file> [--cgnsCompatibilityOff]

Mandatory sub-options:

\( \)

long option	short option	arguments	description
--cgnsFile	-cgns	filename	CGNS file for input and output
--inputTecFile	-it	filename	Tecplot file for input

Optional sub-options:

\( \)

long option	short option	arguments	description
--cgnsCompatibilityOff			Turn off the use of the CGNS compatibility mode when using CGNS 3 (32 bit only)

Example

--writeVolumeSources -cgns TRACE.cgns -it TRACE_volumeSource.dat

The Tecplot file for the volume source named R1_cool derived from the block group R1 with values for the mass flow, the density and the relative radial velocity would look like this:

TITLE = "Volume Sources"
VARIABLES = "MassFlow" "Temperature" "VelocityX" "VelocityR" "VelocityTheta"
#
ZONE T = "R1_cool", I = 1, DATAPACKING = POINT
AUXDATA FamilyName = "R1"
#Mass Flow   Temperature     VelocityX   VelocityR   VelocityTheta
0.25          300.0           0.0         24.0         0.0

Precondition

For each volume source a block container with the same name must be specified.

Note

In GMC 9.1 the volume sources can be set directly.

Since

9.0

setMoleFractions

Reads in mole fractions from Tecplot ASCII file and writes the gas composition into the CGNS file.

This functionality is included in GMC since version 9.1. It is recommended to set the mole fractions within GMC.

Usage

--setMoleFractions/-smf --cgnsFile <filename> --inputTecFile <filename> [optionalOption]

Mandatory sub-options:

\( \)

long option	short option	arguments	description
--cgnsFile	-cgns	filename	CGNS file for input
--inputTecFile	-it	filename	input Tecplot file

Example

--setMoleFractions --cgnsFile TRACE.cgns --inputTecFile TECPLOT.dat --cgnsCompatibilityOff

Precondition

The gas species in the Tecplot file must match the gas species in the CGNS file.

Note

Only one zone (gas composition) is allowed in the Tecplot file.

This functionality is included in GMC since version 9.1. It is recommended to set the mole fractions within GMC.

modifyNodesInCGNS

Reads nodes and their contents from a JSON file and modifies the linked nodes in the CGNS file.

Usage

--modifyNodesInCGNS/-mnc --cgnsFile <filename> --inputJSONFile <filename> [optionalOption]

Mandatory sub-options:

\( \)

long option	short option	arguments	description
--cgnsFile	-cgns	filename	CGNS file for input
--inputJSONFile	-js	filename	input JSON file

Example

--modifyNodesInCGNS --cgnsFile TRACE.cgns --inputJSONFile nodes.json --cgnsCompatibilityOff

To modify a node in the CGNS file the related JSON set must contain four parameters, the path of the parent node, the name of the node, the label (or type) of the node and the new value. The following example changes the value of the node 'MainInlets' to 'rowO1Inlet'.

[
{
  "path": "/Base#1/Component/ControlDomain",
  "name": "MainInlets",
  "label": "Descriptor_t",
  "value": "row01Inlet",
}
]

Note

Currently descriptors can be written only.

decompCircModes

Perform a discrete Fourier transform to decompose the flow field at specified panels into circumferential modes (see Fourier Decompositions for the definition).

In addition, the modes are decomposed into incoming and outgoing parts. Separate files are written for each panel family.

Usage

--decompCircModes/-dcm --cgnsFile  <filename> --harmonicIndex  <integer> --panelfamily <name> --outputFilePath <name> [optionalOption]

Mandatory sub-options:

\( \)

long option	short option	arguments	description
--cgnsFile	-cgns	filename	CGNS file for input
--harmonicIndex	-hi	integer	specify the harmonic index (multiple of fundamental frequency)
--outputFilePath	-ofp	path/name	specify the path of the output files
--panelfamily	-pf	name	name of panel family on which the decomposition is computed

Optional sub-options:

\( \)

long option	short option	arguments	description
--harmonicSet	-hS	two numbers	selects a harmonic set via tuple of fundamental frequency [Hz] and IBPA [degree]

Example

--decompCircModes -cgns TRACE.cgns -hi 0 -pf INTERUP --outputFilePath ../output/prep

writes the files prep_cd_INTERUP_Vane_000_h00.dat, prep_cd_INTERUP_Vane_000_h00_in.dat, and prep_cd_INTERUP_Vane_000_h00_out.dat containing the circumferential Fourier coefficients of the zeroth harmonic (steady/time-mean solution)

Since

8.0