Documentation du code de simulation numérique SUNFLUIDH

Meshgen is a modest mesh generator for cartesian grid. The principle is very simple :

• Each direction {x,y,z} (or {r,$\theta$,z} in cylindrical geometry) is represented by a line.
• Each line can be splitted in several parts over which a distribution law is applied in order to build the discretization nodes.
• Following the CFD code used, these nodes have different definitions :
  • For Chorus, they are the cell centers.
  • For Sunfluidh, they are the cell-face locations.
• Several distribution laws are available
  • Geometric functions
  • Hyperbolic tangent functions
  • Cosine function

After downloading the Meshgen project from the server forge by means of svn:

• go to the directory MESHGEN/TRUNK/SOURCES
• Run the command make: The executable file meshgen.x is created.

The grid parameters are set in the input data file “data_meshgen.dat”.

data_meshgen.dat

==============================================================================================================
            DATA FILE FOR THE MESH GENERATOR MESHGEN (DESCRIPTIONS OF DATA ARE GIVEN BELOW)
==============================================================================================================
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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)
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I-DIRECTION
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Choice of the metric system :  in meter or dimensionless  (0)  - angular in degrees (1)     :
&METRIC_UNIT         Type_of_Metric= 0 /
&MESH_FUNCTION_DATA Function_Name="TANH_ONE_SIDE" Number_of_Cells= 64   Length= 0.5  Left_Cell_Size= 1.2d-03 Reverse_Ordering= .false. /
&MESH_FUNCTION_DATA Function_Name="TANH_ONE_SIDE" Number_of_Cells= 64   Length= 0.5  Left_Cell_Size= 1.2d-03 Reverse_Ordering= .true. /
&MESH_FUNCTION_DATA End_of_Data_Block = .true./
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J-DIRECTION
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Choice of the metric system :  in meter or dimensionless  (0)  - angular in degrees (1)     :
&METRIC_UNIT         Type_of_Metric= 0 /
&MESH_FUNCTION_DATA  Function_Name="REGULAR"           Number_of_Cells= 128  Length= 1.0   Reverse_Ordering= .false. /
&MESH_FUNCTION_DATA End_of_Data_Block = .true./
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K-DIRECTION
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&MESH_FUNCTION_DATA End_of_Data_Block = .true./
 
END OF FILE