# How to plot pressure drop with Periodic BC?

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 April 20, 2009, 01:23 How to plot pressure drop with Periodic BC? #1 New Member   realworld Join Date: Apr 2009 Posts: 16 Rep Power: 17 Anybody can help me to plot the contour of pressure drop of a system with periodic boundary conditions? Although I can read the pressure drop gradient from Monitor window, the contour of pressure drop I plotted is totally periodic, which is only the periodic part of total pressure drop as discribed by Fluent Mannual. So how to plot the real pressure drop field in Fluent? Thanks!

 April 20, 2009, 03:35 #2 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41 If you mean, you want to display all the domain, then go to display/view and there is a panel specific for periodic repeats on the right

 April 20, 2009, 10:33 #3 New Member   realworld Join Date: Apr 2009 Posts: 16 Rep Power: 17 I just want to visualize the real pressure field of the computational domain. Since there must be pressure drop from inlet and outlet, the real pressure field should not be repeated from inlet and outlet, as shown in Fluent. By the way, I monitored the pressure gradient (pa/m) through the Monitor/statistics as suggested by Fluent mannual, but why this value is different from the Monitor/surface/area-weighted average value (pa) divided by the length between periodic inlet and outlet (m)? Since I set periodic BC for inlet and outlet, there is only entity to select in area-weighted average, so is this average value the pressure drop between inlet and outlet? Appreciate all suggestions!

 April 20, 2009, 10:59 #4 Member   Buddy Join Date: Mar 2009 Location: P.R.C. Posts: 30 Rep Power: 17 hi max glad to see you again I've met similar problems in my work. I want to define a point so that I can trace its pressure change but failed cause the command to define a point can only work in 2D model. any suggestions for the 3D model ? thx

 April 20, 2009, 11:17 #5 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41 *bigfans: post a picture of your issue *zjbwow: post a new thread and explain your issue

April 21, 2009, 00:13
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Buddy
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Quote:
 Originally Posted by -mAx- *bigfans: post a picture of your issue *zjbwow: post a new thread and explain your issue

gooooooooooooot it.

 August 7, 2009, 07:48 #7 Member   Join Date: Aug 2009 Posts: 67 Rep Power: 16 Hi guys, I try the second tutorial in Fluent (Modeling Periodic FLow and Heat Transfer). Can i plot the real contour of pressure field?

November 8, 2016, 11:28
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Shamoon Jamshed
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Quote:
 Originally Posted by bigfans I just want to visualize the real pressure field of the computational domain. Since there must be pressure drop from inlet and outlet, the real pressure field should not be repeated from inlet and outlet, as shown in Fluent. By the way, I monitored the pressure gradient (pa/m) through the Monitor/statistics as suggested by Fluent mannual, but why this value is different from the Monitor/surface/area-weighted average value (pa) divided by the length between periodic inlet and outlet (m)? Since I set periodic BC for inlet and outlet, there is only entity to select in area-weighted average, so is this average value the pressure drop between inlet and outlet? Appreciate all suggestions!
Although this post seems very old, hopefully I get some answer, I am experiencing the same issue. By the way bigfans! there is no inlet and outlet because you have defined periodic domains over there. I am also getting some absurd value, with Mega pascal drop and its increasing from -9e6 to -9e5 and so on, I do not know where to stop?