IDA returns error code: -4 ida_check_flag<0! in p2d function in="" p2d="">

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  • Last Post 15 July 2019
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Vsing posted this 12 July 2019

 I am trying to simulate a Lithium ion battery. the Min stop voltage that I have set is 0 V, and I am sure from the experimental results that the battery voltage remains above 2V atleast till 1200 seconds. Yet, the simulation stops due to this error.

Any suggestions about the solution controls, or any other idea?

Any help would be appreciated.

Thanks in advance.

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Vsing posted this 13 July 2019

i opened the MSMD module files to check what the error meant, her's what I found. First I get the check flag -4, meaning convergence failure, shortly after that I get the check flag -14, meaning the IDA solver could not recover.

Vsing posted this 13 July 2019

No matter what scheme I choose from the solution methods, I always end up with convergence problems at the very same flow time instant. If anyone can suggest a possible solution please do so.

rwoolhou posted this 15 July 2019

Looking at those residuals there is no flow. Should there be?

Vsing posted this 15 July 2019

There shouldn't be any flow.

rwoolhou posted this 15 July 2019

What happens at 138s? Ie are there any changes in the model?

Vsing posted this 15 July 2019

No, there is no change in the model, atleast I don't make any. This happens at a battery discharge rate of,

5C at around 130s

3C at around 640s, there happens to be a sudden jump in the residuals uds1 and uds0, and the way the solution controls are, they aren't able to recover from that sort diverging tendency. My initial guess was that the battery must be running out of charge, I increased the capacity manifold, still the sudden jump in the residuals at nearly the same time step. I have tried smoothening the mesh as well.

Vsing posted this 15 July 2019

https://www.sharcnet.ca/Software/Ansys/16.2.3/en-us/help/flu_am/graphics/g_flu_tut_bat_newman_max_temp.png

none of the simulations at 5C or above have been carried out beyond a certain time value. Even in this paper referred in the Ansys bibliography, at high discharge rates, they haven't proceeded for longer times. L. Cai and R.E. White 

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