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32.10.2 Parallel/Partition...

The Parallel/Partition... menu item opens the Partition Grid panel.



Partition Grid Panel


The Partition Grid panel allows you to partition the grid into separate clusters of cells for separate processors on a parallel computer. Note that the Partition Grid panel is slightly different in the serial and parallel solvers. See Section  31.5.4 for details.

figure

Controls

Method   contains a drop-down list of the recursive bisection methods that can be used to create the grid partitions. The choices include the Cartesian Axes, Cartesian Strip, Cartesian X-Coordinate, Cartesian Y-Coordinate, Cartesian Z-Coordinate, Cartesian R Axes, Cartesian RX-Coordinate, Cartesian RY-Coordinate, Cartesian RZ-Coordinate, Cylindrical Axes, Cylindrical R-Coordinate, Cylindrical Theta-Coordinate, Cylindrical Z-Coordinate, Metis, Polar Axes, Polar R-Coordinate, Polar Theta-Coordinate, Principal Axes, Principal Strip, Principal X-Coordinate, Principal Y-Coordinate, Principal Z-Coordinate, Spherical Axes, Spherical Rho-Coordinate, Spherical Theta-Coordinate, and Spherical Phi-Coordinate techniques, which are described in Section  31.5.5.

Number   defines the desired number of grid partitions. This usually matches the number of processors available for parallel computing.

Verbosity   specifies the amount of information to be reported in the text (console) window during the partitioning. With the default value of 1, the solver will print the number of partitions created, the number of bisections performed, the time required for the partitioning, and the minimum and maximum cell, face, interface, and face-ratio variations. (See Section  31.5.6 for details.) If you increase the Verbosity to 2, the partition method used, the partition ID, number of cells, faces, and interfaces, and the ratio of interfaces to faces for each partition will also be printed in the console window. If you decrease the Verbosity to 0, only the number of partitions created and the time required for the partitioning will be reported.

Across Zones   allows partitions to cross zone boundaries (the default). If turned off, it will restrict partitioning to within each cell zone. This is recommended only when cells in different zones require significantly different amounts of computation during the solution phase, for example if the domain contains both solid and fluid zones.

Encapsulate Grid Interfaces   allows you to force the cells surrounding all non-conformal grid interfaces in your mesh to reside in a single partition at all times during the calculation. See Section  31.5.4 for information on using this option.

Encapsulate for Adaption   (available only when Encapsulate Grid Interfaces is turned on) allows you to encapsulate additional layers of cells in the same partition, such that transfer of cells will be unnecessary during parallel adaption.

Print Active Partitions   (parallel solver only) prints the partition ID, number of cells, faces, and interfaces, and the ratio of interfaces to faces for each active partition (see Section  31.5.6 for information about active partitions) in the console window. In addition, it prints the minimum and maximum cell, face, interface, and face-ratio variations.

Print Stored Partitions   (parallel solver only) prints the partition ID, number of cells, faces, and interfaces, and the ratio of interfaces to faces for each stored partition (see Section  31.5.6 for information about stored partitions) in the console window. In addition, it prints the minimum and maximum cell, face, interface, and face-ratio variations.

Print Partitions   (serial solver only) prints the partition ID, number of cells, faces, and interfaces, and the ratio of interfaces to faces for each stored partition in the console window. In addition, it prints the minimum and maximum cell, face, interface, and face-ratio variations.

Set Selected Zones and Registers to Partition ID   allows you to set a value which assigns selected Zones and/or Registers to a specific partition ID. A region or zone is marked before setting the marked cells to one of the partition IDs.

Use Stored Partitions   (parallel solver only) allows you to make the stored cell partitions the active cell partitions. The active cell partition is used for the current calculation, while the stored cell partition (the last partition performed) is used when you save a case file.

Optimizations   contains toggle buttons for activating schemes to optimize the partitions created by the selected bisection method. In addition, the optimization scheme will be applied until appropriate criteria are met, or the maximum number of iterations have been executed. If the Iterations counter is set to 0, the optimization scheme will be applied until completion, without limit on the maximum number of iterations.

Merge   attempts to decrease the number of interfaces by eliminating orphan cell clusters (an orphan cluster is a group of connected cells whose members each have at least one face coincident with an interface boundary).

Smooth   attempts to minimize the number of interfaces by sacrificing cells on the partition boundary to the neighboring partition to reduce the partition boundary surface area.

Pre-Test   instructs the solver to test all coordinate directions and choose the one which yields the fewest partition interfaces for the final bisection. Note that this option is available only when you choose Principal Axes or Cartesian Axes as the partitioning method.

Zones   contains a list of cell zones. Partitioning will be applied to cells in zones selected from this list.

Registers   contains a list of cell registers that have been created using the adaption tools. You can restrict partitioning to a group of cells by selecting a register containing the cells. See Section  31.5.4 for details.

Partition   subdivides the grid into the selected number of partitions using the prescribed method and optimization(s).

Default   sets all controls to their default values, as assigned by FLUENT. After execution, the Default button becomes the Reset button.

Reset   resets the fields to their most recently saved values (i.e., the values before Default was selected). After execution, the Reset button becomes the Default button.


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