Boundar condition for pipe flow
 

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.

i guess u can easily set gravity in operating conditions

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

it depends on ur coordinate system, if ur vertical axis goes up positiv, then jes -9.82 m/s² ..... and this density checkbox u can ignore for water in my opinion

hope i could help u

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

hi,
just let this "specified operating density" box unchecked, that should be fine.

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.

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