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heat source in terms of pulse

Posted Feb 14, 2012, 1:53 p.m. EST Heat Transfer & Phase Change Version 4.2 2 Replies

Patel Chiragkumar
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I have doubt regarding heat source term.

I am writing terms like following, but heat source is not available for later time....

heat source term is:

10e5*(t>=1.000000e-006)*(t<=1.000010e-006)+10e5*(t>=2.000000e-006)*(t<=2.000010e-006)+10e5*(t>=3.000000e-006)*(t<=3.000010e-006)

and time step:

range(1.000000e-006,1e-12,1.000010e-006) range(2.000000e-006,1e-12,2.000010e-006) range(3.000000e-006,1e-12,3.000010e-006)

Please gibe suggestion regarding how to put heat source term to get it in every mention time steps.

Thank you very much

Regards,
Chirag
2 Replies Last Post Feb 14, 2012, 6:32 p.m. EST
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Feb 14, 2012, 3:03 p.m. EST
Hi

what about using a (or several) step function/operator, or a piecewise integration in this way you make smooth transitions, that would help the solver to integrate over the steps.

Then for the ranges , I do not know of any other way, and a repeat(..) does not (yet?) exist, just define a series of ranges, with small steps around the transition and larger steps in between.

note if you have "jumps" like with the bolean function the solver will have some issues jumping from one step to the next



--
Good luck
Ivar
Hi what about using a (or several) step function/operator, or a piecewise integration in this way you make smooth transitions, that would help the solver to integrate over the steps. Then for the ranges , I do not know of any other way, and a repeat(..) does not (yet?) exist, just define a series of ranges, with small steps around the transition and larger steps in between. note if you have "jumps" like with the bolean function the solver will have some issues jumping from one step to the next -- Good luck Ivar
Patel Chiragkumar
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Posted: 1 decade ago Feb 14, 2012, 6:32 p.m. EST


Hi..

Thank you Ivar, for your kind suggestion.

Regards,
Chirag
Hi.. Thank you Ivar, for your kind suggestion. Regards, Chirag

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