# Reference Values for Troughs @ variable Angle?

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 August 13, 2009, 13:17 Reference Values for Troughs @ variable Angle? #1 New Member   Join Date: Aug 2009 Posts: 12 Rep Power: 9 hi there, I need some help of you expertes . I did 2d-meshes of parabolic troughs at certain angles (0,30,60,90,190 degrees) and let fluent do its magic. to illustrate, what it looks in basic I added a picture. I just need a crossection of this parabolic trough and I put in this for reference values. depth=12m length=6m=apterture area=depth*length=72m and the rest was left in default setting. so, the problem is, that the pressure coefficients are near their estimated area, except the 0° one (the open area is vertical upwards). this value is so far of, that I don't know, what I did wrong. I chacked the 180° one and this is okay. so I'm pondering, where the error is. I print the forces and stuff by "report->forces->x/y" so my guess is, that something is wrong with the reference values. the given values are used for all angle-modes, but I din't know for sure, it the length for example will change. and the area is, as far as i know, the projected area from velocity direction, so that would make the area in image #1 Area=length*depth, but Area=height*depth in image #2. and what is, when there are different angles, like in #4? so, could someone please help me with this? I don't find it in the manuals. thank you in advance!

 April 12, 2014, 22:26 wind load on parabolic trough #2 New Member   bassem Join Date: Apr 2014 Posts: 6 Rep Power: 5 hi there, I need some help of you expertes . I am studying wind load on a parabolic solar concentrator at certain angles using Fluent. I choose to start with the 2D simulation in order to evalate the drag and lift coefficient. I have some troubles : 1. I don't find a logical drag coefficient value. It seems related to the references values. How can I set up those values in my case ? 2. If the 2D simulation is sufficient to find a good results ? Thank you for advance Bassem

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