CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

EHD modeling with FLUENT

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By Ramin

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 14, 2008, 16:23
Default 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.
  Reply With Quote

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

Old   January 16, 2008, 03:37
Default 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
  Reply With Quote

Old   January 19, 2010, 03:13
Default re
  #4
New Member
 
Mohammd Aghakhani
Join Date: May 2009
Posts: 18
Rep Power: 16
mamad60 is on a distinguished road
I have this problem too
can anybody help me plz
mamad60 is offline   Reply With Quote

Old   August 8, 2011, 07:27
Default
  #5
Member
 
john
Join Date: Nov 2010
Posts: 50
Rep Power: 15
johnwinter is on a distinguished road
Hi Mohammad,

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

Thanks
John
johnwinter is offline   Reply With Quote

Old   November 11, 2011, 21:06
Default
  #6
New Member
 
emad alidadiani
Join Date: Nov 2011
Posts: 1
Rep Power: 0
emad_63_a288 is on a distinguished road
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??? :-(
emad_63_a288 is offline   Reply With Quote

Old   July 8, 2013, 18:48
Default ehd
  #7
New Member
 
ehsan
Join Date: Jul 2013
Posts: 5
Rep Power: 12
ehsan.utsc is on a distinguished road
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 is offline   Reply With Quote

Old   September 9, 2013, 04:07
Default ehd code
  #8
New Member
 
ehsan
Join Date: Jul 2013
Posts: 5
Rep Power: 12
ehsan.utsc is on a distinguished road
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 is offline   Reply With Quote

Old   September 9, 2013, 04:10
Default
  #9
New Member
 
ehsan
Join Date: Jul 2013
Posts: 5
Rep Power: 12
ehsan.utsc is on a distinguished road
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
ehsan.utsc is offline   Reply With Quote

Old   September 9, 2013, 05:36
Smile
  #10
New Member
 
Mohammd Aghakhani
Join Date: May 2009
Posts: 18
Rep Power: 16
mamad60 is on a distinguished road
Quote:
Originally Posted by ehsan.utsc View Post
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.
If you are ready for cooperation and publishing some paper together, Please contact me through private message
mamad60 is offline   Reply With Quote

Old   July 12, 2014, 08:26
Default hi MR.aghakhani
  #11
New Member
 
ehsan
Join Date: Jul 2013
Posts: 5
Rep Power: 12
ehsan.utsc is on a distinguished road
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
ehsan.utsc is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Modeling porous media with FLUENT newcomer FLUENT 4 September 26, 2013 01:08
Multiphase flow modeling: CFX or FLUENT? Paul Main CFD Forum 8 January 24, 2012 10:25
few quesions on ANSYS ICEMCFD and FLUENT Prakash.Paudel ANSYS 0 August 12, 2010 13:07
Is FLUENT capable of Modeling Breaking Waves Justin FLUENT 0 June 29, 2009 01:03
modeling of free boundary in Fluent Software Mahmoud Alidadi Main CFD Forum 1 August 12, 2005 10:12


All times are GMT -4. The time now is 03:54.