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error in residual computation in Li ion battery simulation.

Posted Apr 20, 2011, 10:56 a.m. EDT Battery Design Version 3.5a 1 Reply

Rajeswaran Radhakrishnan
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Hi,

I am using comsol 3.5a for simulating Li ion battery.I am a new user ,so I am trying to redo the same model which is given in comsol already.But I get the following error,

Error:
Time 3.746334577378822:
Error in residual computation.
Power_of_negative
Function: ^
Failed_to_evaluate_variable
Variable: i0, Defined_as: (((k_pos*((c1max_pos-c1s_pos)^aA_pos))*(c1s_pos^aC_pos))*(c2^aA_pos))
Failed_to_evaluate_variable
Variable: i_loc, Defined_as: ((exp((((Far*aA_pos)*eta)/(Rg*T)))-exp(((((-aC_pos)*Far)*eta)/(Rg*T))))*i0)
Failed_to_evaluate_expression
Expression: d(((-K1eff*phi1x*test(phi1x)/L_pos-i_loc*Sa_pos*L_pos*test(phi1))-(0))*(dvol),{test@1})
Last time step is not converged.

Can you please help me out in this?

Thanks,

Rajeswaran.
1 Reply Last Post Sep 14, 2011, 5:11 p.m. EDT
COMSOL Moderator

Hello Rajeswaran Radhakrishnan

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Cheng Zheng
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Posted: 1 decade ago Sep 14, 2011, 5:11 p.m. EDT
Hi, has your problem been solved? I also encounter such problem in my simulation.
No clue what might cause this problem.

One thing is that I have quite some logic function (T>Tm) etc in my materials properties. This might create step functions, and cause the error?
Hi, has your problem been solved? I also encounter such problem in my simulation. No clue what might cause this problem. One thing is that I have quite some logic function (T>Tm) etc in my materials properties. This might create step functions, and cause the error?

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