nastran manual


Thermal Loads

This section describes the available thermal loads in heat transfer analysis.

Initial Temperature

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This condition assigns the initial temperature of the grid nodes. This condition can be assigned to points, lines and surfaces. It will have effect over grid nodes of the mesh included in the geometry entity with the condition assigned.

Heat Flux

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This condition assigns a prescribed heat flow. This condition can be assigned to points, lines and surfaces. To apply this condition to lines and surfaces has to be combined with “heat boundary” condition to define the geometrical information of the condition. Heat flux is analogous to distributed pressure in Static Analysis.


Convection Boundary

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This condition defines a convection boundary. It can be assigned to points lines and surfaces. To apply this condition is mandatory to assign a heat boundary condition to define geometric properties of the boundary. By pressing de “Temp…” is possible to define a temperature-dependent convection coefficient. This option can be useful for nonlinear heat transfer analysis.

Radiation Boundary

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This condition defines a radiation boundary. It can be assigned to points lines and surfaces. To apply this condition is mandatory to assign a heat boundary condition to define geometric properties of the boundary. By pressing de “Temp…” is possible to define a temperature-dependent radiation view factor. This option can be useful for nonlinear heat transfer analysis.

Volumetric Heat

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This condition defines a volumetric heat distribution. The volumetric heat condition plays the same role of gravity in Static Analysis.

 It can be assigned to lines, surfaces and volumes. To apply this condition is mandatory to assign a heat boundary condition to define geometric properties of the elements, i.e. volume of linear elements equal to lengthxsection area.