Index

Mesh decomposition and optimisation

Ver: 2   DESCRIPTION This menu allows to decompose a mesh into calculation sub-parts and to optimise the numbering of the finite elements.

Calculation sub-parts are necessary to run the parallel version of the software, but can also reduce the CPU cost of a simulation on serial computer.

Optimisation of the numbering is always recommended when the mesh generator cannot perform it. The CPU cost of a simulation can be drastically reduced if a new numbering can decrease the frontal width of a mesh.

  OPTIONS
 
-1 
 Upper level menu
1
 Enable/Disable decomposition in sub-parts
Switches on/off the splitting of the mesh into smaller computation portions
2
 Select Chaco/Metis decomposer
The chaco decomposer is accessible if the parallel module of Polyflow is available.
3
 Modify the number of sub-parts
Sets the desired number of calculation sub-parts.
Not available if decomposition is disabled.
4
 Enable/Disable numbering optimisation
Numbering optimisation is always recommended.
5
 Select Chaco/Cuthill McKee optimiser
The chaco optimiser is accessible if the parallel module of Polyflow is available.
6'
 Optimize the maximum frontal width (memory size)
Chooses the reduction of the greatest frontal width. The size of the global matrix increases linearly with this value.
Not available if optimisation is disabled.
6"
 Optimize the average frontal width (CPU time)
Chooses the reduction of the average frontal width. The number of operations to perform in the solver increases with the square of this value. 
Not available if optimisation is disabled.
7
 Options for optimisation
Allows to control the parameters of the optimisation algorithm.
Only available if Chaco optimiser is chosen.
8
 Enable/Disable cost evaluation
Switches on/off the evaluation of the cost of the mesh with the current numbering 
9
 Options for cost evaluation
Allows to control the parameters of the cost evaluation.
Not available if cost evaluationis disabled.
10
 Enter the filename of the initial mesh
Sets the pathname of the original mesh file
11
 Enter the filename of the new mesh
Sets the pathname of the new mesh file
    12    
 Run computation
Launches the decomposition/optimisation/cost evaluation
SEE ALSO