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Considering Gravity effect(or Hydradynamic) in CFX

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Old   September 20, 2006, 05:22
Default Considering Gravity effect(or Hydradynamic) in CFX
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klarke
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Now one question about gravity effect comes to me. i'd like to simulate a channel flow in cfx considering the effect of gravity. The fluid material is constant density water. How can i simulate it? In my testing, the option of buoyancy is not usefull for constant density. How should i do? any suggestion from you?
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Old   September 20, 2006, 05:55
Default Re: Considering Gravity effect(or Hydradynamic) in
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Joe
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Two phase homogenous model.
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Old   September 20, 2006, 09:57
Default Re: Considering Gravity effect(or Hydradynamic) in
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Patrick
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Free Surface Flow - Tutorial 7
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Old   September 20, 2006, 20:23
Default Re: Considering Gravity effect(or Hydradynamic) in
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klarke
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If I only want to simulate single phase flow,and the material is constant density(not related by temperature or pressure),how should i do?
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Old   September 21, 2006, 01:27
Default Re: Considering Gravity effect(or Hydradynamic) in
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Patrick
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If Buoyancy doesn't help you could program yourself a hydrostatic pressure - see also tutorial 7. Actually I don't understand your problem. Maybe you should be more precise.
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Old   September 21, 2006, 03:09
Default Re: Considering Gravity effect(or Hydradynamic) in
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klarke
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Thanks, For example, i 'd like to simulate a water siphon tunnel.you know the gravity is very important for this case. But as the explaination of CFX documents, the buoyancy is only affected by density change. in my case,the fluid material is constant density water.
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Old   September 24, 2006, 16:07
Default Re: Considering Gravity effect(or Hydradynamic) in
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Astrid
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If you do not have two different phases in your model, then there is no need to include buoyancy. You have include the hydrostatic pressure differences in your pressure boundaries.

Astrid
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Old   October 2, 2006, 03:53
Default Re: Considering Gravity effect(or Hydradynamic) in
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TobiasZ
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There is the full buoyancy model and the Boussinesq approximation available in CFX. This info might be useful. Read CFX manual for this. TobiasZ
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