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32.1.19 File/Write/Surface Clusters...

The File/Write/Surface Clusters... menu item is used to save view factor and surface cluster parameters for the surface-to-surface radiation model. It opens the View Factor and Cluster Parameters panel.



View Factor and Cluster Parameters Panel


The View Factor and Cluster Parameters panel allows you to set parameters related to surface clusters and view factors for the surface-to-surface radiation model. See Section  13.3.12 for information about using this panel.

figure

Controls

Cluster Parameters   contains parameters for creating surface clusters.

Faces per Surface Cluster for Flow Boundary Zones   specifies the number of faces in each surface cluster for flow boundary zones. The default is set to 1. See Section  13.3.7 for details about clustering.

Apply to All Walls   applies the value specified in the Faces per Surface Cluster for Flow Boundary Zones field to all wall zones adjacent to fluid zones.

View Factor Parameters   contains parameters for computing view factors.

Surfaces   specifies the geometric orientation of surface pairs with respect to each other.

Blocking   specifies that there is another surface blocking the views between the surfaces under consideration.

Nonblocking   specifies that there is no obstruction between the surfaces under consideration.

Smoothing   specifies whether or not smoothing should be performed on the view factor matrix. See Section  13.3.7 for details about smoothing.

None   specifies that the view factor matrix will not be smoothed.

Least Squares   specifies that the least-squares method will be used for smoothing the view factor matrix.

Method   specifies the method for computing view factors. See Section  13.3.12 for information about choosing a method.

Adaptive   specifies the use of the adaptive method for computing the view factors.

Hemicube   specifies the use of the hemicube method for computing the view factors. The hemicube method is available only for 3D cases.

Hemicube Parameters   contains parameters related to the hemicube method for computing view factors. These inputs are available only when Hemicube is selected under Method. See Section  13.3.12 for information about setting hemicube parameters.

Resolution   specifies the resolution of the hemicube. The default value is set to 10. You can increase the value to reduce aliasing effects that can lead to overestimated or underestimated view factors.

Subdivision   specifies the number of subfaces into which each face is divided. The default value is set to 10.

Normalized Separation Distance   specifies the ratio of the minimum face separation to the effective diameter of the face. The default value is set to 5.


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