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Need help for microfluidic device simulation with high surface charge
Posted 2017年6月6日 GMT-4 14:18 MEMS & Nanotechnology, Fluid & Heat, MEMS & Piezoelectric Devices, Microfluidics, Mesh, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 5.2a 0 Replies
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I'm studying on a simulation of a conical nanopore with high surface charge density. In the physics, creeping flow, electrostatics and transport of diluted species are included. The model works perfectly and I get expected result with the surface charge density of -0.02C/m^2. Now I'm trying to increase the surface charge to -0.2C/m^2. By only changing the surface charge density, the model failed to get a result and said:
"Failed to find a solution for all parameters,
even when using the minimum parameter step.
No convergence, even when using the minimum damping factor.
Returned solution has not converged."
I thought it should be the mesh problem, so I changed to coarser mesh but failed again. The error said:
"Failed to find a solution.
Maximum number of Newton iterations reached.
There was an error message from the linear solver.
The relative error (0.098) is greater than the relative tolerance.
Returned solution is not converged."
I tried several solutions in the forum but still got stuck here. Is there any good suggestions to fix the problem?
Thank you so much,
Juntao
Hello Juntao Dong
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