Global Prism parameters

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Global Prism parameters

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The following parameters can be specified in this area:

Global Prism parameters

Global Prism parameters

By setting these parameters, the values are modified globally for all parts using the same values. Please see "Interaction between global and local parameters" for more information.

Number of layers: Number of prism layers (greater than zero).

Height: Height of the first prism layer. A warning will be displayed if this value is set to zero. Prism layers will be not created for parts with this parameter set to zero.

warning_height_set_to_zero

Height ratio: Expansion ratio from the first layer of elements on the surface. This ratio will be multiplied by the element height of the previous layer to define the height of the next layer. Only real values grater than zero are permitted for this parameter.

Growth law: Determines the height of the layers given the initial height and height ratio. Two options are available:

- Linear: the total height of the prism layers is defined by:

and the height of the last prism layer by:

- Exponential: the total height of the prism layers is defined by:

and the height of the last prism layer by:

mesh_parameters_prism_explanation

where:

height of the first layer

height of the last layer

total height of the prism layers

number of layers

height ratio

emax

max. Size value of the part

 

One layer and split: If you enable this option only one layer will be created initially and splitted automatically. By enabling this option, the number of prism layers for all parts will be set to the global number of layers value (see "Interaction between global and local parameters" for more information). Change the prism layers number locally for a part is not permitted while this option is selected (spin button disabled).
This method is generally faster and more stable for the prism generation than the standard option, in which all layers are created step by step. In fact, using the option "One layer and split" no pyramids will be created if the first prism layer was created successfully.

Two important additional global parameters are available to control the prism generation. These two parameters are special parameters only available in the CFturbo2ICEM panel. By modifying this two parameters, some local parameters can be manipulated globally for all parts (see "Interaction between global and local parameters"  for more information):  

Total height: Setting this parameter, the user can define the total height of the whole prism layers globally for all parts. Other parameters will be recalculated.

Height factor: Setting this parameter, the user can define the height factor globally for all parts. The height factor is the ratio between the total height of the whole prism layers and the Max. Size defined for the part (see the  picture above). Right values of height factor allow creating a mesh with a smooth transition from prism to tetra elements.

Please see the ICEM-CFD documentation for more information.