Solar Updraft Tower

Sandeep Patel · August 16, 2011, 18:03

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...

ghorrocks · August 16, 2011, 18:48

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?

Sandeep Patel · August 16, 2011, 19:21

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.

ghorrocks · August 17, 2011, 18:29

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.

Sandeep Patel · August 17, 2011, 18:42

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.

atit · December 21, 2011, 03:40

Quote:

Originally Posted by Sandeep Patel

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.

August 16, 2011, 18:03	Solar Updraft Tower	#1
Sandeep Patel New Member Sandeep Patel Join Date: Aug 2011 Posts: 3 Rep Power: 3	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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August 16, 2011, 18:48		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 7,022 Rep Power: 60	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?

August 16, 2011, 19:21		#3
Sandeep Patel New Member Sandeep Patel Join Date: Aug 2011 Posts: 3 Rep Power: 3	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.

August 17, 2011, 18:29		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 7,022 Rep Power: 60	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.

August 17, 2011, 18:42		#5
Sandeep Patel New Member Sandeep Patel Join Date: Aug 2011 Posts: 3 Rep Power: 3	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.