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bijubalancollins

Radiation heat transfer modelling in Optistruct

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Hi,

 

for models without discretization errors (mesh refined until convergence) utilizing structural materials (relatively high stiffness, low density) the 300 seconds simulation would probably not be solvable in a reasonable time without supercomputers.

 

Explicit simulations can be solved faster using:
-DT/NODA/CST or Advanced Mass Scaling
-Time scaling applies the load more quickly than in the quasi-static experiment in order to reduce the simulation time. To minimize the inertial effects the kinetic energy should be low (5-10%) compared to the internal energy for most of the simulation. 

However, there are practical limits on how much faster the solution can be obtained without invalidating the results. 

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Yes, both are supported in thermal analysis. Please refer to RD-E: 5300 Thermal Analysis where nodal mass scaling is used. 

moving_source_0000.rad moving_source_0001.rad

 

/THERMAL Factor to speed-up the thermal analysis may be used for time scaling.

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21 hours ago, Hyperman said:

Yes, both are supported in thermal analysis. Please refer to RD-E: 5300 Thermal Analysis where nodal mass scaling is used. 

moving_source_0000.rad 456.93 kB · 2 downloads moving_source_0001.rad 407 B · 3 downloads

 

/THERMAL Factor to speed-up the thermal analysis may be used for time scaling.

Hi , I am not able to locate the /THERMAL card in the ENGINE keywords. Can you please help me locate it. I am using HW2019 student version.

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No problem, you can do the same manually.  /THERMAL  just makes it easier to adjust the model with a single parameter:

The physical time will be reduced by time-factor. All thermal properties will be automatically scaled, no need to change the Radioss Starter inputs. Time values in Radioss Engine input file must be modified.

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18 minutes ago, Hyperman said:

No problem, you can do the same manually.  /THERMAL  just makes it easier to adjust the model with a single parameter:

The physical time will be reduced by time-factor. All thermal properties will be automatically scaled, no need to change the Radioss Starter inputs. Time values in Radioss Engine input file must be modified.

 

Ok cool. Let me use it that way. Thanks!

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