Hello,
I am trying to solve a set of reaction-diffusion equations and the heat equation, using general form PDE.
On one boundary some of the boundary fluxes depend on a quantity (electrochemical potential) that is the solution a transcendental equation involving boundary values of the dependent variables (concentrations and temperature). Because I have to use the time-discrete solver, the previous step values of boundary concentrations and temperature could be used in this transcendental equation.
I cannot figure out how (where in the model) to set up this transcendental equation.
I was trying to define this electrochemical potential as a variable defined on a boundary, but it seems that the expression defining this variable cannot be an implicit equation.
Using this equation as an additional boundary constraint produced no formal complaints, but the execution stopped after about 40 iteration with "Nonlinear solver did not converge".
Any other ideas?
Thanks in advance,
Miroslav
I am trying to solve a set of reaction-diffusion equations and the heat equation, using general form PDE.
On one boundary some of the boundary fluxes depend on a quantity (electrochemical potential) that is the solution a transcendental equation involving boundary values of the dependent variables (concentrations and temperature). Because I have to use the time-discrete solver, the previous step values of boundary concentrations and temperature could be used in this transcendental equation.
I cannot figure out how (where in the model) to set up this transcendental equation.
I was trying to define this electrochemical potential as a variable defined on a boundary, but it seems that the expression defining this variable cannot be an implicit equation.
Using this equation as an additional boundary constraint produced no formal complaints, but the execution stopped after about 40 iteration with "Nonlinear solver did not converge".
Any other ideas?
Thanks in advance,
Miroslav