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Hello, I'm preforming a space antenna thermal analysis in Nastran with a radiation enclose. When I include the radiation enclose the analysis take a lot of time and resources. There is any possibility to calculate the VF in a separated analysis?

carlos.dias
Hello,

I'm preforming a space antenna thermal analysis in Nastran with a radiation enclose. When I include the radiation enclose the analysis take a lot of time and resources. There is any possibility to calculate the VF in a separated analysis?
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    Use below entry in begin bulk.
     
    NLMOPTS,HEMI,1
     
    This makes view factor calculation much faster than default nastran solver.
     
    There is also a way to do VF calculation once and use it for other files.
    The RADCAV entry 6th PRTPCH to be set to 0 or blank. This will write out a PCH file which contains a RADMTX and RADLST entries.
     
    RADCAV 10 0. 0
     
    You just have to include the *.pch files in other runs and it will use the VF from the file, rather than recalculate..
     
    See RADCAV in QRG.
    7. If a RADLST and RADMTX entry exists for this cavity ID, new view factors are not computed and the existing RADLST and RADMTX are used in the thermal analysis.
     
    Attached a sample file for reference.
    Attached Files (1)
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  • 0
    Use below entry in begin bulk.
     
    NLMOPTS,HEMI,1
     
    This makes view factor calculation much faster than default nastran solver.
     
    There is also a way to do VF calculation once and use it for other files.
    The RADCAV entry 6th PRTPCH to be set to 0 or blank. This will write out a PCH file which contains a RADMTX and RADLST entries.
     
    RADCAV 10 0. 0
     
    You just have to include the *.pch files in other runs and it will use the VF from the file, rather than recalculate..
     
    See RADCAV in QRG.
    7. If a RADLST and RADMTX entry exists for this cavity ID, new view factors are not computed and the existing RADLST and RADMTX are used in the thermal analysis.
     
    Attached a sample file for reference.
    Attached Files (1)
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