sunfluidh:meshgen_doc
Différences
Ci-dessous, les différences entre deux révisions de la page.
Les deux révisions précédentesRévision précédenteProchaine révision | Révision précédenteDernière révisionLes deux révisions suivantes | ||
sunfluidh:meshgen_doc [2017/12/03 16:53] – yann | sunfluidh:meshgen_doc [2020/10/27 16:28] – yann | ||
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Ligne 6: | Ligne 6: | ||
* Following the CFD code used, these nodes have different definitions : | * Following the CFD code used, these nodes have different definitions : | ||
* For Chorus, they are the cell centers. | * For Chorus, they are the cell centers. | ||
- | * For Sunfluidh, they are the cell-face locations. | + | * For Sunfluidh, they are the cell-face locations |
* Several distribution laws are available : | * Several distribution laws are available : | ||
* Geometric functions | * Geometric functions | ||
Ligne 15: | Ligne 15: | ||
<note important> | <note important> | ||
- | | + | |
</ | </ | ||
- | After downloading the Meshgen project from the server forge by means of svn: | + | After downloading the Meshgen project from the server forge by means of svn (svn co –username your_login https:// |
* go to the directory MESHGEN/ | * go to the directory MESHGEN/ | ||
* Run the command make: The executable file meshgen.x is created. | * Run the command make: The executable file meshgen.x is created. | ||
Ligne 24: | Ligne 24: | ||
==== Meshgen settings ==== | ==== Meshgen settings ==== | ||
- | The grid parameters are set in the input data file " | + | The grid parameters are set in the input data file " |
- | * The cell size is variable along the I-direction. | + | |
- | * The I-line is split in two equal parts. | + | |
- | * The function " | + | |
- | * The grid is regular along the J-direction | + | |
- | + | ||
- | + | ||
- | <file txt data_meshgen.dat> | + | |
- | + | ||
- | ============================================================================================================== | + | |
- | DATA FILE FOR THE MESH GENERATOR MESHGEN (DESCRIPTIONS OF DATA ARE GIVEN BELOW) | + | |
- | ============================================================================================================== | + | |
- | ------------------------------------------------------------------------------------------------------------- | + | |
- | Blocks of data are associated to segments along a specific direction (There are as many blocks as segments) | + | |
- | See below the TEMPLATES to select your own block of data associated to the selected distribution law) | + | |
- | ------------------------------------------------------------------------------------------------------------- | + | |
- | --------------------------------------- | + | |
- | I-DIRECTION | + | |
- | --------------------------------------- | + | |
- | Choice of the metric system : in meter or dimensionless | + | |
- | & | + | |
- | & | + | |
- | & | + | |
- | & | + | |
- | --------------------------------------- | + | |
- | J-DIRECTION | + | |
- | --------------------------------------- | + | |
- | Choice of the metric system : in meter or dimensionless | + | |
- | & | + | |
- | & | + | |
- | & | + | |
- | --------------------------------------- | + | |
- | K-DIRECTION | + | |
- | --------------------------------------- | + | |
- | + | ||
- | & | + | |
- | + | ||
- | END OF FILE | + | |
- | + | ||
- | </ | + | |
==== Data set description ==== | ==== Data set description ==== | ||
In the data file, each block of data is attributed to a direction (I,J or K).\\ | In the data file, each block of data is attributed to a direction (I,J or K).\\ | ||
Each direction can be split in several parts (segments) on which a specific distribution law is applied in order to place the discrete nodes.\\ | Each direction can be split in several parts (segments) on which a specific distribution law is applied in order to place the discrete nodes.\\ | ||
- | Each distribution law is defined by means of namelists that are described at the end of this page. The available functions are (click on it for details): | + | Each distribution law is defined by means of namelists that are described at the end of this page.\\ |
- | * [[Reg_fct_meshgen | Regular function]] (Function_name= | + | For illustrating how that works, let consider a domain length $L$ (in an arbitrary direction) split in $2$ parts with lengths $L_1$ and $L_2$, respectively (see the figure below). Discrete coordinates are distributed with a given law (by considering here $N_1=6$ for the first segment, $N_2=8$ for the second one). \\ The origin coordinate is not included in the procedure. It is added by the code.\\ The coordinate located at the upper end of the segment belongs to this segment, not to the following one. |
- | * [[TH1S_meshgen |Hyperbolic tangent function "one side" | + | {{ : |
- | * [[TH2S_meshgen |Hyperbolic tangent function "two sides" | + | |
- | * [[GL_meshgen | Gauss-Lobatto distribution ]](Function_Name= | + | |
- | * [[geom1_meshgen | Geometric series "type 1"]] (Function_Name= | + | The available |
- | * [[geom2_meshgen | Geometric series "type 2"]] (Function_Name= | + | * [[Reg_fct_meshgen | Regular function]] (Function_name= |
+ | * [[TH1S_meshgen |Hyperbolic tangent function "one side" | ||
+ | * [[TH2S_meshgen |Hyperbolic tangent function "two sides" | ||
+ | * [[GL_meshgen | Gauss-Lobatto distribution ]](Function_Name= | ||
+ | * [[geom1_meshgen | Geometric series "type 1"]] (Function_Name= | ||
+ | * [[geom2_meshgen | Geometric series "type 2"]] (Function_Name= | ||
These functions get a specific data set : | These functions get a specific data set : | ||
Ligne 85: | Ligne 51: | ||
* End_of_Block_Data : logical set to .true. to declare the end of a data structure (by default it set to .false. by the program) | * End_of_Block_Data : logical set to .true. to declare the end of a data structure (by default it set to .false. by the program) | ||
- | __A complete | + | __A template is provided |
<note important> | <note important> | ||
Ligne 93: | Ligne 59: | ||
The block of data must be closed with the special namelist \\ & | The block of data must be closed with the special namelist \\ & | ||
</ | </ | ||
- | ==== Templates for each function ==== | + | |
- | <file template> | + | |
- | & | + | |
- | & | + | |
- | & | + | |
- | & | + | |
- | & | + | |
- | & | + | |
- | & | + | |
- | & | + | |
- | & | + | |
- | </ | + | |
==== Generate the grid with Meshgen ==== | ==== Generate the grid with Meshgen ==== | ||
- | After setting the data set in the file " | + | After setting the data set in the file " |
Few questions are asked : | Few questions are asked : | ||
- | * Choice of CFD code : OLORIN or SUNFLUIDH (1) CHORUS (2) ---> | + | * Choice of CFD code : OLORIN or SUNFLUIDH (1) CHORUS (2) ---> |
- | * MPI domain decomposition (1) or not (0) ---> | + | * MPI domain decomposition (1) or not (0) ---> |
For the case of MPI domain decomposition, | For the case of MPI domain decomposition, | ||
Ligne 118: | Ligne 73: | ||
| | ||
| | ||
+ | |||
+ | ==== Output files ==== | ||
The grid data are recorded in the appropriate files that depend on the code previously selected: | The grid data are recorded in the appropriate files that depend on the code previously selected: | ||
* For Chorus, maille_yyyyy.dat : data are recorded in binary format. " | * For Chorus, maille_yyyyy.dat : data are recorded in binary format. " | ||
* For sunfluidh : | * For sunfluidh : | ||
- | * For sequential computation, | + | |
- | * For domain decomposition (MPI parallelization), | + | |
==== Check the grid ==== | ==== Check the grid ==== |
sunfluidh/meshgen_doc.txt · Dernière modification : 2020/10/27 16:31 de yann