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BCHANGE in SOL103?

Benny Hill
Sometimes it might be useful to have more control about glued areas between two bcbodies in SOL103. In SOL101 and SOL400 I can use BCHANGE to achieve this but this option is not available in SOL103. My current workaround for SOL103 is to define additional bcbodies only containing the elements which should be glued. This is a lot of work and often leads to the following warnings in the f06 file because two bodies share the same nodes:
 
"warning: node    11764 belongs to bodies  28  33. for the contact algorithm it will belong to body   33 only."
 
Will the BCHANGE option or something similar become available for SOL103 in future releases of Nastran? Is there a smarter way to gain more control about glued regions in SOL103? Thanks for any suggestion!
 
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    I see your point and agree.
     
    In the end Nastran has to know which faces to glue. The general approach will find matching faces and all 4 faces. To limit it to just two matching faces contact faces must be selected as you have done. When you define the BCHANGE one still has to define FACES to exclude. I suppose there is timesavings to be had during modeling assuming the faces being excluded are fewer. From Computational time perspective timesaving would be minimal.
     
    I assume what you are looking for a feature in Nastran is to have the contact algorithm work in connection with ALLBODY option to exclude certain areas in sol103. I could open an enhancement request for this if one does not exist for linear solution where GLUED option is supported. If others on the forum can chime with their though it would be good.
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  • 0
    I see your point and agree.
     
    In the end Nastran has to know which faces to glue. The general approach will find matching faces and all 4 faces. To limit it to just two matching faces contact faces must be selected as you have done. When you define the BCHANGE one still has to define FACES to exclude. I suppose there is timesavings to be had during modeling assuming the faces being excluded are fewer. From Computational time perspective timesaving would be minimal.
     
    I assume what you are looking for a feature in Nastran is to have the contact algorithm work in connection with ALLBODY option to exclude certain areas in sol103. I could open an enhancement request for this if one does not exist for linear solution where GLUED option is supported. If others on the forum can chime with their though it would be good.
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