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-   -   [GAMBIT] How to geometry and meshing my model (https://www.cfd-online.com/Forums/ansys-meshing/109571-how-geometry-meshing-my-model.html)

lalolala November 21, 2012 01:03

How to geometry and meshing my model
 
1 Attachment(s)
Dear all,

im kind of new user of GAMBIT and FLUENT. anybody can help me to build this model for me?

i can build the geometry but having problem to do the meshing.
is look like heat exchanger with simple dimension. the fluid flow inside should be crude and the fluid between the inner pipe and outer pipe is water circulation from inlet to outlet.

can further email in at bennybenn95@gmail.com

-mAx- November 21, 2012 02:05

what is your problem with meshing?

lalolala November 21, 2012 02:51

1 Attachment(s)
below picture if my model...and its look like this when i trying to mesh...

i appreciate if anyone can help me on this matter..

-mAx- November 21, 2012 02:56

can you enable the shaded mode on and repaste a picture?

lalolala November 21, 2012 03:09

1 Attachment(s)
u means like this?

-mAx- November 21, 2012 03:16

ok
Now you create a (yz) surface big enough to be sure that it will cut your geometry.
you move it till middle of your geometry and you split the volume.
Delete one half and again shaded mode on, and post picture (you will see how it looks like in your domain)

lalolala November 21, 2012 03:18

will try it later..later i will post again here..thanks for ur guidance.. :)

-mAx- November 21, 2012 03:21

wait!
your error is simply because you are trying to mesh your volume with hex-cooper.
And for sure you cannot.
Try with tetra-hexcore

lalolala November 21, 2012 06:48

2 Attachment(s)
ive done meshing using tet/hybrid TGrid..successful..

but my concern, how am i gonna put thing like

Inner pipe - Copper
fluid 2 - crude
Outer pipe - steel
fluid 1- crude

how am i going to set the boundary cond?how am i sure that its gonna be like pic 2 attached. how to make sure that the water flow inlet and goes out to the outlet can transfer heat to the product pipe?

kindly help...im going to present this project very soon and now i really running out of time..

-mAx- November 21, 2012 07:03

if both fluids are not going to be mixed, then you should have to seperated fluid volume. Then you need to define a fluid zone at both domains (but not same fluid zone else the solver will understand it is only one fluid)
For heat transfer, I have no experience but look at shell conduction http://aerojet.engr.ucdavis.edu/flue...e253.htm#33058

lalolala November 21, 2012 07:14

ok...means i no need to subtract the inner pipe and the outer pipe? and just set the fluid contain inside?

how about the heat transfer surface, its going to be like 2 different layers, isnt it?

-mAx- November 21, 2012 07:19

Quote:

Originally Posted by lalolala (Post 393401)
ok...means i no need to subtract the inner pipe and the outer pipe? and just set the fluid contain inside?

do the trick with cut-plane to see how it looks like in your domain

Quote:

Originally Posted by lalolala (Post 393401)
how about the heat transfer surface, its going to be like 2 different layers, isnt it?

I am not sure, but I believe you have to disconnect both volumes at this surface. Gambit will create 2 superposed surfaces and you gonne treat them as 2 different layers.
>> again here I have 0-experience :D

lalolala November 21, 2012 07:23

alright2...i will try my best...

anyway, thanks for ur respond.. :):)

lalolala November 24, 2012 11:42

1 Attachment(s)
i did the shell conduction...i do have only 1 ting layer between 2 fluid.. but i didnt get the result i want.. the temperature still not influence the inner fluid..its like there is a boundary, a resistance that not allow the temperature distributed inside the fluid..

any idea?


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