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-   -   EHD modeling with FLUENT (http://www.cfd-online.com/Forums/fluent/47015-ehd-modeling-fluent.html)

 Ramin January 14, 2008 16:23

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

 saghir January 15, 2008 08:47

Re: EHD modeling with FLUENT

Hi, Check the boundary condition for uds-0

 ramin January 16, 2008 03:37

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

 johnwinter August 8, 2011 06:27

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??? :-(

 ehsan.utsc July 8, 2013 17:48

ehd

salam agha ramin mitunam emaili azat dashte basham ta dar morede ehd tu fluen azatun chand ta soal beporsam?vaghean lotf mikonin age in lotfo dar haghe man anjam bedin vagheiatesh man ye mikhastam ba fluent dar morede ehd kar konam amma nemidunam chetori emalesh konam shoma mitunin komakam konin?emaile man e.shabahang@gmail.com hastesh khosh hal misham behem ye email bezanin

 ehsan.utsc September 9, 2013 03:07

ehd code

Hi.i am working experimentally on EHD and heat transfer and i want to model the flow stream lines in the fluent.can any body help me how to model the ehd in fluent?i dont have any code for ehd in fluent,please help me.:)

 ehsan.utsc September 9, 2013 03:10

hi mr.ramin can i work with you in ehd with flunet i have some experimental data on ehd heat transfer on a plate can you help me on solving this problem?thank you

Quote:
 Originally Posted by ehsan.utsc (Post 450583) Hi.i am working experimentally on EHD and heat transfer and i want to model the flow stream lines in the fluent.can any body help me how to model the ehd in fluent?i dont have any code for ehd in fluent,please help me.:)
Hi Ehsan
I were able successfully model EHD with COMSOL. But about Fluent I had some UDF but it 's not working and requires some modification.