# Boundar condition for pipe flow

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 May 10, 2011, 05:28 Boundar condition for pipe flow #1 New Member   Join Date: Mar 2011 Posts: 11 Rep Power: 6 I am beginner in CFD. I need some help, how to take into consideration the effect of the gravity in vertcial pipeflow (upward flow). Thanks.

 May 10, 2011, 07:07 #2 New Member   eddy Join Date: Apr 2011 Posts: 8 Rep Power: 6 i guess u can easily set gravity in operating conditions

 May 10, 2011, 08:04 #3 New Member   Join Date: Mar 2011 Posts: 11 Rep Power: 6 Yes that where i need help, do i check in gravity and make -9.8m2/s ... aldo do i need to check in operating density and what vale, I am simulating vertical pipe flow of water

 May 11, 2011, 02:22 #4 New Member   eddy Join Date: Apr 2011 Posts: 8 Rep Power: 6 it depends on ur coordinate system, if ur vertical axis goes up positiv, then jes -9.82 m/s˛ ..... and this density checkbox u can ignore for water in my opinion hope i could help u

 May 12, 2011, 00:12 #5 New Member   Join Date: Mar 2011 Posts: 11 Rep Power: 6 Thanks shimmyya for your reply. Yes my cooridnate system is +y upwars i.e. I have taken my reference coordinates (0,0,0) at the top of the pipe. As I understand I do need to check in the gravity option box and do not need to fill the operating density ... but by default it shows a value of 1.225 .. shoud I make this zero or someother value as far i understood the value subsituted here will be subtracted from fluid density i.e. [rho(fluid) - rho(op density] g.h? waiting for your reply. Thanks once again

 May 12, 2011, 02:05 #6 New Member   eddy Join Date: Apr 2011 Posts: 8 Rep Power: 6 hi, just let this "specified operating density" box unchecked, that should be fine.

 May 13, 2011, 02:23 #7 New Member   Join Date: Mar 2011 Posts: 11 Rep Power: 6 Need help, can you plz help ... how to calcuate the pressure drop in pipe flow ... can't seem 2 understand the Fluent output plots .. as values I have do not come anywhere near.

 May 16, 2011, 09:44 #8 New Member   eddy Join Date: Apr 2011 Posts: 8 Rep Power: 6 i dont know if this help u , but u can set probe-points which can read out the data of this points like pressure, velocity ...... could be also good to know what version of FLUENT u use

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