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August 16, 2017, 07:06 |
how to change richardson number in fluent??
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#1 |
New Member
Mohamad
Join Date: Aug 2017
Posts: 6
Rep Power: 8 |
hi . can anyone help me how change RICHARDSON NUMBER in fluent?
my geometry is a T-shaped enclosure. |
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August 16, 2017, 08:47 |
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#2 |
Senior Member
Cees Haringa
Join Date: May 2013
Location: Delft
Posts: 607
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The same as you would do it without FLUENT.
You have the choice to change gravity, density, or velocity. Of course, do check if other relevant numbers change when toying with any of these. |
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August 16, 2017, 09:16 |
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#3 |
New Member
Mohamad
Join Date: Aug 2017
Posts: 6
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tanx for helping me. so in ri=Gr/Re^2 , for example i want fix my richardson number at 0.2 . and my Re number is 500 .so i have to calculate Gr number and change density ??
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August 16, 2017, 09:22 |
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#4 |
Senior Member
Cees Haringa
Join Date: May 2013
Location: Delft
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If you want to change Ri while keeping Re constant, change gravity (which doesn't influence Re)
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August 16, 2017, 10:28 |
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#5 |
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Mohamad
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August 16, 2017, 11:39 |
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#6 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
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Note that changing density will also change the Reynolds number.
Thermal expansion coefficient is a fluid/material property. However, if you choose certain equations of state, it may not be available to you. If you take pressure, temperature as state variables, then the thermal expansivity of a gas and its density are interconnected. You really need to consider what your equation of state is. But in general, changing the thermal expansion coefficient does change the Reynolds number. |
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August 16, 2017, 12:25 |
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#7 | |
New Member
Mohamad
Join Date: Aug 2017
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Quote:
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August 17, 2017, 04:09 |
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#8 |
Senior Member
Cees Haringa
Join Date: May 2013
Location: Delft
Posts: 607
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Well sure you can change the thermal expansion coefficient; again, in principle you can change any parameter present in Ri. However, you should ensure that you are not changing other relevant numbers simultaneously. Since you are planning to keep Re constant, density and velocity are unsuitable. As LuckyTrans states, thermal expansion is unwise, too.
So again, that leaves gravity. What do you have against changing that? |
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