What is the difference between ‘Chained analysis’ and ‘Coupled analysis’?

Hello to all,

I am trying to run a coupled analysis of heat transfer and structure analysis. According to ‘Overview of Analysis Types’ in MSC Nastran nonlinear user’s guide SOL 400, “chained physics” and “coupled physics” are existing and STEP and SUBSTEP are used. What is the difference between two physics?

I think that chained analysis is near the weak coupling method and the other is similar to a strong coupling method which can consider an interaction with each other such as heat transfer-structure interaction. Is that correct?

Thank you

0 Hrishikesh Phadke over 6 years ago

Correct. In a chained approach it will run the thermal solve completely, then start the structural solve from the end results of the thermal solve. See attached sts file for chained simulation.

The coupled solution uses a staggered approach where it will run one time step for the thermal, then one time step for the structural solution. This will repeat till the end of solution time.

The coupled approach can be taken when the temperature variation is large and the thermal conductivity /Youngs modulus are changing significantly due to temperature differences.
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0 kameya over 6 years ago

Hello Hrishikesh,

Thank you very much for your kind explanations. I checked my sts file and understood well.
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