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geomtry development for coolant flow in hot tube

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Old   August 7, 2012, 20:06
Default geomtry development for coolant flow in hot tube
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n7310889
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Hi,
I'm modeling "heat transfer from steel tube to flowing oil" in FLUENT. So I developed a geometry in ANSYS design modeller. I sketched one circle (dia 50 mm) for fluid domain and two circles (dia 50 and 54mm) for solid domain. Then I have extruded them 2000 mm.This geometry I have imported in a mesh component, and developed sweep mesh for both of the bodies independently. Is that okay? Because, if I import this mesh in FLUENT, it creates two additional "WALLS": wall tube and wall fluid. If i set these walls to "INTERFACE", and interface them as FLUID-SOLID interface activating "COUPLED" option, it generates four new walls: two of them are coupled wall, one is shadow and the other is just wall. Using this mesh if I do 1st model in fluent, it does not make any problem. However, when ever I try to reopen the fluent component for the system it says: 'UNASSIGNED INTERFACE" and/or "WRONG ARGUMENT, INVALID THREAD" lub lub. Could any of you please tell me whats going wrong and suggest me, what should I do?
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Old   August 9, 2012, 06:29
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Quote:
Originally Posted by n7310889 View Post
Hi,
I'm modeling "heat transfer from steel tube to flowing oil" in FLUENT. So I developed a geometry in ANSYS design modeller. I sketched one circle (dia 50 mm) for fluid domain and two circles (dia 50 and 54mm) for solid domain. Then I have extruded them 2000 mm.This geometry I have imported in a mesh component, and developed sweep mesh for both of the bodies independently. Is that okay? Because, if I import this mesh in FLUENT, it creates two additional "WALLS": wall tube and wall fluid. If i set these walls to "INTERFACE", and interface them as FLUID-SOLID interface activating "COUPLED" option, it generates four new walls: two of them are coupled wall, one is shadow and the other is just wall. Using this mesh if I do 1st model in fluent, it does not make any problem. However, when ever I try to reopen the fluent component for the system it says: 'UNASSIGNED INTERFACE" and/or "WRONG ARGUMENT, INVALID THREAD" lub lub. Could any of you please tell me whats going wrong and suggest me, what should I do?
Hi,

did you solve your problem???

i have the same problem!!
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Old   August 9, 2012, 18:53
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Quote:
Originally Posted by n7310889 View Post
Hi,
I'm modeling "heat transfer from steel tube to flowing oil" in FLUENT. So I developed a geometry in ANSYS design modeller. I sketched one circle (dia 50 mm) for fluid domain and two circles (dia 50 and 54mm) for solid domain. Then I have extruded them 2000 mm.This geometry I have imported in a mesh component, and developed sweep mesh for both of the bodies independently. Is that okay? Because, if I import this mesh in FLUENT, it creates two additional "WALLS": wall tube and wall fluid. If i set these walls to "INTERFACE", and interface them as FLUID-SOLID interface activating "COUPLED" option, it generates four new walls: two of them are coupled wall, one is shadow and the other is just wall. Using this mesh if I do 1st model in fluent, it does not make any problem. However, when ever I try to reopen the fluent component for the system it says: 'UNASSIGNED INTERFACE" and/or "WRONG ARGUMENT, INVALID THREAD" lub lub. Could any of you please tell me whats going wrong and suggest me, what should I do?
when you import mesh to fluent, go to the interface mesh tab, and create a mesh interface(choose the same interfaces that gives you error as unassigned interface).

i hope it works.
i had the same problem. but i solved it using the method that already told you.
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Old   August 10, 2012, 01:09
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Hi tmeysam92

Sorry I didn't get you. Could you please explain a little more about (choose the same interfaces that gives you error as unassigned interface)? Another thing is, is it fluid-fluid or solid-fluid interface? Which interface option should I activate? I have activated coupled interface option earlier. Finally, what kind of boundary conditions should I enetr into the auto generated walls, or I don't need to bother with those walls?
I will be grateful if any of you please reply me.

Regards
n7310889
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Old   August 10, 2012, 12:42
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Quote:
Originally Posted by n7310889 View Post
Hi tmeysam92

Sorry I didn't get you. Could you please explain a little more about (choose the same interfaces that gives you error as unassigned interface)? Another thing is, is it fluid-fluid or solid-fluid interface? Which interface option should I activate? I have activated coupled interface option earlier. Finally, what kind of boundary conditions should I enetr into the auto generated walls, or I don't need to bother with those walls?
I will be grateful if any of you please reply me.

Regards
n7310889
Hi,

i attached some pictures of my geometry.

i was working on FSI (fluid structure interaction) problem.

in this geometry i want to calculate temperature distribution in fluid and solid(pipe(fluid part and solid part)).

i meshed the geometry in ansys meshing. then i used named selection for interfaces between fluid and solid(FIG1).

when i import the mesh to fluent, and i use CHECK button, it gives UNASSIGNED error(like FIG2).

I used MESH INTERFACE tab in fluent. then i chose the solid and fluid interfaces. (FIG3).

know there is not error, if use CHECK button.

if you do the same thing that i did, i think your problem will be solved.

my English writing is not good. sorry if i made mistakes.
Attached Images
File Type: jpg FIG1.jpg (86.2 KB, 5 views)
File Type: jpg FIG2.jpg (90.2 KB, 3 views)
File Type: jpg FIG3.jpg (91.1 KB, 3 views)
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Old   August 10, 2012, 12:51
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one more thing.

is your geometry a pipe or like a pipe??? if yes, why do not you use this way,

ansys design modeler- CREATE-primitives-cylinder
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