Sphere-Fluid Heat Transfer

elina · April 26, 2013, 09:31

Hi all,
I have a sphere fluid flow in a channel.
I want to study conduction in the sphere
1) I create 2 zone ( 1 fluid zone and 2 for solid zone (sphere)).
2) I set all interfaces between solid and fluid to wall.
3) After exporting mesh to fluent, I see a -shadow boundary condition of type wall for each interface wall.
4) I enable heat equation. (knowing that the two wall are coupled)
5) Fluid flowing at 0.0001m/s water,370K
6) Sphere (copper) 300K initial temp.2spheres attached together....

Grid convergence has to be done...so Steady state simulation was tried...though the solution converges....
the problem after running simulation there no transfers conjugate between fluid and solid the temperature of solid remains stable (initial temperature).

Please help me ..give me suggestions regarding the Setup of case esp boundary conditions...

Thanks in advance......

diamondx · April 26, 2013, 14:50

in the solution method, what scheme did you use ?? i suggest pressure coupled

elina · April 27, 2013, 10:28

I used pressure velocity coupled-SIMPLE
and all second order upwind..

diamondx · April 27, 2013, 13:05

start by coupled. first order see how it looks

elina · April 28, 2013, 20:31

Hi

Yes I tried that also..still the temperature at that outlet seems to be the same as 370 or 369.99

SO it means there is no conduction happening in the sphere...I mean the temperature is not transferred to the sphere from the fluid...What could be the reason..Any guess and can you tell what exactly this steady state will do in this kind of simulation....??

April 26, 2013, 09:31	Sphere-Fluid Heat Transfer	#1
elina Member Elina Mathew Join Date: Mar 2013 Posts: 47 Rep Power: 13	Hi all, I have a sphere fluid flow in a channel. I want to study conduction in the sphere 1) I create 2 zone ( 1 fluid zone and 2 for solid zone (sphere)). 2) I set all interfaces between solid and fluid to wall. 3) After exporting mesh to fluent, I see a -shadow boundary condition of type wall for each interface wall. 4) I enable heat equation. (knowing that the two wall are coupled) 5) Fluid flowing at 0.0001m/s water,370K 6) Sphere (copper) 300K initial temp.2spheres attached together.... Grid convergence has to be done...so Steady state simulation was tried...though the solution converges.... the problem after running simulation there no transfers conjugate between fluid and solid the temperature of solid remains stable (initial temperature). Please help me ..give me suggestions regarding the Setup of case esp boundary conditions... Thanks in advance......

April 26, 2013, 14:50		#2
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 28	in the solution method, what scheme did you use ?? i suggest pressure coupled __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

April 27, 2013, 13:05		#4
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 28	start by coupled. first order see how it looks __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

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April 27, 2013, 10:28		#3
elina Member Elina Mathew Join Date: Mar 2013 Posts: 47 Rep Power: 13	I used pressure velocity coupled-SIMPLE and all second order upwind..

April 28, 2013, 20:31		#5
elina Member Elina Mathew Join Date: Mar 2013 Posts: 47 Rep Power: 13	Hi Yes I tried that also..still the temperature at that outlet seems to be the same as 370 or 369.99 SO it means there is no conduction happening in the sphere...I mean the temperature is not transferred to the sphere from the fluid...What could be the reason..Any guess and can you tell what exactly this steady state will do in this kind of simulation....??