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Old   August 16, 2011, 18:03
Default Solar Updraft Tower
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Sandeep Patel
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Hey..I am doing a research on solar updraft tower and i want to use ANSYS CFX to simulate the solar updraft tower. I am having problems with the boundary conditions.. For the inlet i have used the boundary type OPENING with a defined value of static pressure. The outlet i have used the boundary type OUTLET with static pressure as 0Pa.For the base, the collector wall and the chimney wall i have used the boundary type WALL with mass and momentum as free slip wall and heat transfer as adiabatic.. For the domain i have used air ideal gas with buoyancy model as buoyant and i have specified the gravity and the reference density as well as the reference location. for the heat transfer model i have used total energy and the turbulence model as laminar. i also have provided the value for insolation for the collector..Can someone help me with the boundary conditions for the Solar Updraft Tower...
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Old   August 16, 2011, 18:48
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Glenn Horrocks
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Sounds OK so far. Note that the flow probably is turbulent so your selection of a laminar model is probably wrong. What is not working in yuour model?
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Old   August 16, 2011, 19:21
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Sandeep Patel
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I am trying to compare my CFX results to a real experimental model results but the temperature change in the solar updraft tower is not matching. So, i am thinking that something is wrong with my boundary conditions or domain conditions.
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Old   August 17, 2011, 18:29
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Sounds reasonable. But as I have no idea of the experiment you are comparing to or the details of how you set up your simulation I cannot see how we are going to be much help. You are going to have to figure this one out.
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Old   August 17, 2011, 18:42
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I am trying to compare my results with this results from this journal paper (Experimental and theoretical performance of a demonstration solar chimney model-part 2: Experimental and theoretical results and economic analysis) by N. Pasumarthi and S. A. Sherif.
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Old   December 21, 2011, 04:40
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Quote:
Originally Posted by Sandeep Patel View Post
Hey..I am doing a research on solar updraft tower and i want to use ANSYS CFX to simulate the solar updraft tower. I am having problems with the boundary conditions.. For the inlet i have used the boundary type OPENING with a defined value of static pressure. The outlet i have used the boundary type OUTLET with static pressure as 0Pa.For the base, the collector wall and the chimney wall i have used the boundary type WALL with mass and momentum as free slip wall and heat transfer as adiabatic.. For the domain i have used air ideal gas with buoyancy model as buoyant and i have specified the gravity and the reference density as well as the reference location. for the heat transfer model i have used total energy and the turbulence model as laminar. i also have provided the value for insolation for the collector..Can someone help me with the boundary conditions for the Solar Updraft Tower...
At the inlet, I used 0 Pa as the total pressure and the flow properties seems reasonable. You should try it. Good luck.
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