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How to implement equations for simulation of DC current |
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April 21, 2015, 16:56 |
How to implement equations for simulation of DC current
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#1 |
Member
Peng Liang
Join Date: Mar 2014
Posts: 59
Rep Power: 12 |
Hello Foamers,
I want to simulate the electric potential within a electrode, whose Current is DC mode, 30A,but at the tip the sectional area becomes much smaller. I have tried setting the gradient of potential at the top to be like -j/sigma. I wonder : 1. which equations to be implemented for calculating potential. 2. which type of boundary condition to be set for potential at the other electrode surface. Thanks , Peng |
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April 23, 2015, 03:51 |
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#2 |
Senior Member
Join Date: Oct 2013
Posts: 397
Rep Power: 18 |
The equation you want to solve is laplace(sigma, phi) = 0.
Then E = - grad(phi) and j = sigma * E. You can either set the potential as fixedValue boundary condition for phi or specify a current by using a fixed gradient with -j/sigma. |
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October 13, 2022, 22:58 |
Hi Peng, I have the same question. Have you solved this question? really really thank
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#3 | |
New Member
Ding Yan
Join Date: Oct 2022
Posts: 10
Rep Power: 3 |
Quote:
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October 14, 2022, 00:45 |
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#4 |
Member
Tatsuya Shimizu
Join Date: Jul 2012
Posts: 42
Rep Power: 13 |
Hi All
Does this functionObject "OpenFOAM/OpenFOAM-v2206/src/functionObjects/solvers/electricPotential" not match your requirements? tutorial: OpenFOAM/OpenFOAM-v2206/tutorials/multiphase/interFoam/RAS/electrostaticDeposition See: https://www.openfoam.com/documentati...l.html#details
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October 14, 2022, 01:20 |
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#5 |
Senior Member
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October 14, 2022, 03:36 |
steady-state equation
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#6 | |
New Member
Ding Yan
Join Date: Oct 2022
Posts: 10
Rep Power: 3 |
Quote:
this is a steady-state equation. as you know, since the internal resistance, our poisson's equation has a source term which changes with time.and you can refer this paper(Theoretical Analysis of Potential and Current Distributions in Planar Electrodes of Lithium-ion Batteries), so we don't know how to solve the question in the negative and positive electrode. |
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October 14, 2022, 03:40 |
reply
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#7 | |
New Member
Ding Yan
Join Date: Oct 2022
Posts: 10
Rep Power: 3 |
Quote:
but in NTGK model of battery, there is a type of ion current J in the poisson equation. we want to set this model in the OF. |
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October 14, 2022, 09:43 |
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#8 |
Senior Member
Join Date: Oct 2013
Posts: 397
Rep Power: 18 |
The equation I mentioned is only for classical steady-state current without surface charges and with quasi-neutrality. If you have charge distributions you may have to model the charge carrier drift somehow. I'm afraid I can't help with that very much.
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