# EHD modeling with FLUENT

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 January 14, 2008, 16:23 EHD modeling with FLUENT #1 Ramin Guest   Posts: n/a 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 ehsan.utsc likes this.

 January 15, 2008, 08:47 Re: EHD modeling with FLUENT #2 saghir Guest   Posts: n/a Hi, Check the boundary condition for uds-0

 January 16, 2008, 03:37 Re: EHD modeling with FLUENT #3 ramin Guest   Posts: n/a Hi Saghir. Thank you for your attention. I chek the uds_0 boundaries, they are correct. but I have convergence problem yet. thanks

 January 19, 2010, 03:13 re #4 New Member   Mohammd Aghakhani Join Date: May 2009 Posts: 12 Rep Power: 8 I have this problem too can anybody help me plz

 August 8, 2011, 06:27 #5 Member   john Join Date: Nov 2010 Posts: 50 Rep Power: 6 Hi Mohammad, I too have same as you mentioned regarding charge density. how to compute the flux for charge density?. Thanks John

 November 11, 2011, 21:06 #6 New Member   emad alidadiani Join Date: Nov 2011 Posts: 1 Rep Power: 0 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??? :-(

 July 8, 2013, 17:48 ehd #7 New Member   ehsan Join Date: Jul 2013 Posts: 5 Rep Power: 4 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

 September 9, 2013, 03:07 ehd code #8 New Member   ehsan Join Date: Jul 2013 Posts: 5 Rep Power: 4 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.

 September 9, 2013, 03:10 #9 New Member   ehsan Join Date: Jul 2013 Posts: 5 Rep Power: 4 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

September 9, 2013, 04:36
#10
New Member

Mohammd Aghakhani
Join Date: May 2009
Posts: 12
Rep Power: 8
Quote:
 Originally Posted by ehsan.utsc 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.

 July 12, 2014, 07:26 hi MR.aghakhani #11 New Member   ehsan Join Date: Jul 2013 Posts: 5 Rep Power: 4 I have worked with comsol and I have some problem in solving.my mail is e.shabahang@gmail.com please contact with me about coprating in comsol I have some comsol file I will be glad to coporate with you in this problem and publish some papers

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