Temperature condition inside an entire region

Twinsen_cfd · November 19, 2014, 08:59

Hello everybody,

I am doing a thermal analysis between two solid regions. I would like to set a temperature condition on the first region (1500°C). In the second region, there is a boundary temperature condition (200°C).

I know how to set a temperature condition on a boundary, but I don't know how to set a temperature condition inside a whole region. I just can set an energy source (volumetric heat source, total heat source, specific heat source).

Thank you for reading,
Twinsen_cfd

olesen · November 20, 2014, 04:15

I don't properly understand your physics. If the entire region really is a constant temperature, you can't actually calculate its temperature at all, since you've just defined this. In this case, that isothermal region can also be removed and replaced with isothermal boundary conditions for any attached regions.
However, I'm guessing that this probably isn't what you meant. Maybe you just want something that is mostly isothermal, in which case you could specify the initial temperature for that region, provide isothermal boundaries and then adjust the material properties (rho, cp, etc) to ensure that this region responses extremely slowly.

Twinsen_cfd · November 20, 2014, 04:36

Hello Olesen,

Thank you for your response. In fact I would like that the first region (1500 °C) translates along the second region (with a boundary at 200 °C) and solve the temperature field inside the second region.

But I think we can't move a boundary condition (perhaps it is possible?). That is why I created the first region (which can move along the second one). Do you understand what I want to do ?

Twinsen_cfd

November 19, 2014, 08:59	Temperature condition inside an entire region	#1
Twinsen_cfd New Member Julien Join Date: Nov 2014 Posts: 4 Rep Power: 12	Hello everybody, I am doing a thermal analysis between two solid regions. I would like to set a temperature condition on the first region (1500°C). In the second region, there is a boundary temperature condition (200°C). I know how to set a temperature condition on a boundary, but I don't know how to set a temperature condition inside a whole region. I just can set an energy source (volumetric heat source, total heat source, specific heat source). Thank you for reading, Twinsen_cfd

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November 20, 2014, 04:15		#2
olesen Senior Member Mark Olesen Join Date: Mar 2009 Location: https://olesenm.github.io/ Posts: 1,715 Rep Power: 40	I don't properly understand your physics. If the entire region really is a constant temperature, you can't actually calculate its temperature at all, since you've just defined this. In this case, that isothermal region can also be removed and replaced with isothermal boundary conditions for any attached regions. However, I'm guessing that this probably isn't what you meant. Maybe you just want something that is mostly isothermal, in which case you could specify the initial temperature for that region, provide isothermal boundaries and then adjust the material properties (rho, cp, etc) to ensure that this region responses extremely slowly.

November 20, 2014, 04:36		#3
Twinsen_cfd New Member Julien Join Date: Nov 2014 Posts: 4 Rep Power: 12	Hello Olesen, Thank you for your response. In fact I would like that the first region (1500 °C) translates along the second region (with a boundary at 200 °C) and solve the temperature field inside the second region. But I think we can't move a boundary condition (perhaps it is possible?). That is why I created the first region (which can move along the second one). Do you understand what I want to do ? Twinsen_cfd