EHD modeling with FLUENT
 

Dear all

I'm trying to model EHD with FLUENT. I must solve the Gauss equation that is a diffusion equation and charge conservation equation that is a convection type equation. del(eps*del(pot))=qc div(qc(b.E+U))=b.qc^2/eps (E and U are vectors) where E=-grad(pot) and eps and b are permittivity and mobility of fluid respectively and pot and qc are potential and charge density. I have written some UDFs but when I run the Fluent, solution diverges immediately with this message: "divergence detected in AMG solver: uds-0" Under relaxations don't have any effect to solve this problem. Could anybody help me?

Thanks,

Ramin

Re: EHD modeling with FLUENT
 

Hi, Check the boundary condition for uds-0

Re: EHD modeling with FLUENT
 

Hi Saghir. Thank you for your attention. I chek the uds_0 boundaries, they are correct. but I have convergence problem yet. thanks

re
 

I have this problem too
can anybody help me plz

Hi Mohammad,

I too have same as you mentioned regarding charge density. how to compute the flux for charge density?.

Thanks
John

hi my friends
i have a university project that i explain it for you.
there is a cylindrical combustion chamber in my project with 5 cm diameter,30 cm height and there is a cylindrical burner with 1 cm diameter,3 cm height in the end of combustion chamber.burnur's fuel is premixed methan.also there is a wire with electric current(I) at the center of cylinder.this wire make an electric field around itself and affect on flame that exit from burnur.now i want model it with CFX or FLUENT.i hope that i could explain it as well as you want . can i model it??? are there any body who help me??? :-(