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 July 19, 2012, 03:47 Shadow Wall and temperature #1 New Member   Norger Join Date: Oct 2011 Posts: 25 Rep Power: 13 Hey, I have two bodies in a room with air. One body has on one specific surface a defined temperature and I want to see how the temperature influences the two bodies and the air in the room. My question is how I rightly set the boundary conditions for the shadow walls? I read some things about the setting "coupled" but I can not use it for the surface with the defined temperature because by using "coupled", I can not set the temperature. My idea: I set the surface with the temperature and its shadow wall to a wall with the same defined constant temperature and not "coupled". The air in the room gets a starting temperature. The other bodies and their shadow walls are defined as "coupled". Is that correct? Is the temperature at the coupled walls set as a zero-point and, therefore do I have to use the temperature difference from 0 K to my defined temperature? Thank you very much in advance for your answers

 July 19, 2012, 04:07 #2 Super Moderator     Alex Join Date: Jun 2012 Location: Germany Posts: 3,210 Rep Power: 44 If you model the Fluid (the air inside the room) and the solid bodies together, things are a bit different. The wall between the solid body and the fluid acts as an interface. If you want them to exchange heat, the coupled option is indeed the right choice. Now the temperature would have to be set in the solid domain if you want the wall to remain at a constant temperature. chek321 likes this.

 July 19, 2012, 04:45 #3 New Member   Norger Join Date: Oct 2011 Posts: 25 Rep Power: 13 Ok, so I have to set a temperature at: Cell Zone Boundaries -> Fixed Values -> constant Temperature. But what could I do if my wall will not have a volume? The temperature is just at a surface on the body.

 July 19, 2012, 05:00 #4 Super Moderator     Alex Join Date: Jun 2012 Location: Germany Posts: 3,210 Rep Power: 44 You mean if there is no solid volume on the other side of the wall, but the wall is just a boundary for the fluid phase? There shouldn't even be a shadow wall. In this case, you don't need an interface. Just set the boundary type to wall and set the temperature value.

 July 19, 2012, 05:07 #5 New Member   Norger Join Date: Oct 2011 Posts: 25 Rep Power: 13 There is a shadow wall because this surface with the defined temperature is on the solid body and, therefore, it is between the fluid and the solid. It is just a surface and has no volume.

 April 22, 2016, 10:08 #7 New Member   Gabes Join Date: Apr 2016 Posts: 11 Rep Power: 8 hello , i face same probleme here solution please ?

 April 22, 2016, 10:09 #8 New Member   Gabes Join Date: Apr 2016 Posts: 11 Rep Power: 8 hello , i face same probleme here solution please ?

 April 22, 2016, 11:51 #9 Senior Member   Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,112 Rep Power: 60 The default material name in the wall is aluminum. The material is used for modelling shell conduction at a wall, or for modelling wall thermal resistance. There is also a wall thickness (the default thickness is 0 m). The wall material plays no role in the hydrodynamics (only the heat transfer) and in the case where the thickness is 0, there is no influence on the heat transfer because the shell conduction model is not invoked. Grandup likes this.

September 28, 2019, 01:23
#10
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Join Date: Oct 2017
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Rep Power: 7
Quote:
Dear
In my opinion, since the wall-14 and the wall-7 which has been created due to the coupled wall and you wanted to maintain as fluid, you should change the material in the corresponding cell zone as fluid as your choice not as aluminium . Fluent do not understand the material name whether solid or fluid, i think.

 September 28, 2019, 12:43 #11 New Member   rampada rana Join Date: Oct 2017 Posts: 5 Rep Power: 7 Dear In my opinion, since the wall-14 and the wall-7 which has been created due to the coupled wall and you wanted to maintain as fluid, you should change the material in the corresponding cell zone as fluid as your choice not as aluminium . Fluent do not understand the material name whether solid or fluid, i think. best

 Tags boundary conditions, coupled wall, shadow wall

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