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Gravity Components for Inclined Channel

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Old   August 4, 2013, 05:31
Default Gravity Components for Inclined Channel
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Ashish Jain
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Hi, I am a new user to Fluent. I have a 3D inclined channel say 5 degree inclined from horizontal(X-axis) on XY plane. While enabling gravity, what will be the X, Y and Z components of gravity. Flow is from lower to higher elevation. A small explanation would be highly appreciated. Will it be 0,-9.81,0 or 9.81sin5,-9.81cos5,0 or something else?
For a 2D vertical channel(upward flow) X and Y components are 0 and -9.81.(From a Fluent tutorial).
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Old   August 17, 2013, 03:00
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Does anybody have any idea about it??
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Old   August 17, 2013, 04:44
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The direction of the gravity vector is entirely your choice.
No one here knows in which direction gravity is pointing in your simulation.
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Old   August 18, 2013, 09:41
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Thanks for your reply..Gravity is acting downward.And I want gravity effects to be included..For 5 degree inclination from X-direction(with flow from bottom to higher level)...I guess..there has to be a fixed set of gravity components to see appropriate results(Specially in cases, when flow is in opposite direction,i.e. from higher to lower level,flow will take place just because of gravity.)
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Old   December 27, 2013, 05:33
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I was wondering if anyone could answer that.
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Old   December 27, 2013, 07:54
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You have to know that the gravity vector is written as : g(vector): (gx,gy,gz)

A picture of your problem would be better to have an understanding of the orientation of the geometry!
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Old   December 28, 2013, 01:46
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Here is the image. Fluid is flowing from left to right. I need to know the gravitational acceleration components to be entered in fluent general section.
Inclination is 5 degree from horizontal.
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Old   December 28, 2013, 02:01
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In figure it is horizontal(isometric view), but if it has to be inclined at 5 degree from X-axis, how one will incorporate the gravity effects.
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Old   December 28, 2013, 05:03
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still the same direction in y-direction (based on your description)
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Old   December 28, 2013, 05:34
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In Y-direction, it will be same as before. Inclination is with respect to X-axis only. Does it make it clearer? Let me know plz.
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