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sunfluidh:meshgen_doc [2017/12/02 15:22] – créée yannsunfluidh:meshgen_doc [2017/12/02 16:48] – [Data set description] yann
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 Meshgen is a modest mesh generator for cartesian grid. The principle is very simple :  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 direction {x,y,z} (or {r,$\theta$,z} in cylindrical geometry) is represented by a line.
-  * Each line can be splitted in several part over which a distribution law is applied in order to define the discretization nodes.+  * 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 :   * Following the CFD code used, these nodes have different definitions :
     * For Chorus, they are the cell centers.      * For Chorus, they are the cell centers. 
Ligne 11: Ligne 11:
     * Hyperbolic tangent functions     * Hyperbolic tangent functions
     * Cosine function     * Cosine function
 +
 +==== Compilation procedure ====
 +
 +<note important>
 + **For the class 5AF32, this step is automatically made by the install procedure.**
 +</note>
 +
 +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.
 +
 +==== Meshgen settings ====
 +
 +The grid parameters are set in the input data file "data_meshgen.dat". A simple example of a 2D grid is given just below :
 +   * The cell size is variable along the I-direction. 
 +     * The I-line is split in two equal parts. 
 +     * The function "TANH_ONE_SIDE" is applied over each part, with a reverse distribution over the 2nd part. This way is useful to define a perfect symmetrical distribution in regard to the mid-plane.
 +   * 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  (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./
 +---------------------------------------
 +J-DIRECTION
 +---------------------------------------
 +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./
 +---------------------------------------
 +K-DIRECTION
 +---------------------------------------
 +
 +&MESH_FUNCTION_DATA End_of_Data_Block = .true./
 +
 +END OF FILE
 +
 +</file>
 +
 +==== Data set description ====
 +
 +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 distribution law is associated to a function defined by a namelist. The available functions are :
 +   * Regular function (Function_name= REGULAR_MESH)
 +   * Hyperbolic tangent function "one side" (Function_Name= TANH_ONE_SIDE_MESH)
 +   * Hyperbolic tangent function "two sides" (Function_Name= TANH_TWO_SIDES_MESH)
 +   * Gauss-Lobatto distribution (Function_Name= GAUSS_LOBATTO_MESH)
 +   * Geometric series "type 1" (Function_Name= GEOMETRIC_SERIE_1_MESH)
 +   * Geometric series "type 2" (Function_Name= GEOMETRIC_SERIE_2_MESH)
 +
 +These functions get a specific data set :
 +   * Number_of_Cells : Number of cells over the segment (for all functions).
 +   * Length          : Length of the segment (for all functions).
 +   * Left_Cell_Size  : Reference size of the cell placed at the left tip of the segment (for all functions except the regular function)
 +   * Right_Cell_Size : Reference size of the cell placed at the right tip of the segment (for hyperbolic function "two sides" and geometric series "Type 1" only)   
 +   * Reverse_Ordering : Reverse the ordering of the distribution if set to .true.
 +   * 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 template is provided below.__
 +
 +<note important>
 +For each direction, the block of data must start with the namelist \\ &METRIC_UNIT         Type_of_Metric= 0 / \\
 +   * Type_of_Metric= 0 specifies a usual metric
 +   * Type_of_Metric= 1 specifies an angular metric. The unit is the degree.
 +The block of data must be closed with the special namelist \\ &MESH_FUNCTION_DATA End_of_Data_Block = .true./
 +</note>
 +==== Template for each function ====
 +<file template>
 +&METRIC_UNIT Type_of_Metric= 0 /         ---> Used to define the metric unit
 +&MESH_FUNCTION_DATA  Function_Name="GAUSS_LOBATTO"     Number_of_Cells= 30   Length= 1.0                                                    Reverse_Ordering= .false. /
 +&MESH_FUNCTION_DATA  Function_Name="TANH_ONE_SIDE"     Number_of_Cells= 40   Length= 1.0  Left_Cell_Size= 1.0d-03                           Reverse_Ordering= .false. /
 +&MESH_FUNCTION_DATA  Function_Name="GEOMETRIC_SERIE_1" Number_of_Cells= 60   Length= 1.0  Left_Cell_Size= 1.0d-02  Cell_Ratio= 1.05d-00     Reverse_Ordering= .false. /
 +&MESH_FUNCTION_DATA  Function_Name="REGULAR"           Number_of_Cells= 100  Length= 1.0                                                    Reverse_Ordering= .false. /
 +&MESH_FUNCTION_DATA  Function_Name="TANH_TWO_SIDES"    Number_of_Cells= 100  Length= 1.0  Left_Cell_Size= 1.0d-02  Right_Cell_Size= 1.0d-02 Reverse_Ordering= .false. /
 +&MESH_FUNCTION_DATA  Function_Name="GEOMETRIC_SERIE_2" Number_of_Cells= 50   Length= 1.0  Left_Cell_Size= 1.0d-02  Right_Cell_Size= 5.0d-02 Reverse_Ordering= .false. /
 +&MESH_FUNCTION_DATA  Function_Name="TANH_ONE_SIDE"     Number_of_Cells= 100  Length= 1.0  Left_Cell_Size= 1.0d-03                           Reverse_Ordering= .false. /
 +&MESH_FUNCTION_DATA  End_of_Data_Block= .true.        /
 +</file>
 +
sunfluidh/meshgen_doc.txt · Dernière modification : 2020/10/27 16:31 de yann
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