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Old   November 20, 2002, 00:43
Default Coordinate System
  #1
Pravesh kumar
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hi I needed your immediate help.I am having my geometry in Gambit in X-Y plane.I want to know when i am having my Geometry in fourth coordinate whether i should put gravitational acceleration (g) 9.81 or -9.81. Your immediate help is required. With my warm personel Regards pravesh

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Old   November 20, 2002, 04:28
Default Re: Coordinate System
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gavin
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If I understand your question correctly, you should have 'g' working opposite to the postive y direction, therefore it will be -9.81 m/s^2
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Old   November 20, 2002, 12:29
Default Re: Coordinate System
  #3
Pravesh kumar
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hi But I having my geometry in fourth coordinate i.e +X,-Y As I have already taken -Y dirn so i am not sure whether to put one more -ve for the downward dirn of gravitational acceleration(g).

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Old   November 20, 2002, 13:38
Default Re: Coordinate System
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Erwin
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Just check in Fluent in which direction 'the apple should fall'; in the positive y direction or the negative one. If it is the negative y direction, gravity is -9.81 otherwise +9.81.
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Old   November 20, 2002, 13:49
Default Re: Coordinate System
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Pravesh Kumar
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Dear Erwin As i am having my geometry in fourth coordinate (ie +X and -Y.).As the apple will fall downward ie -Y dirn and i have already taken the -Y dirn in coordinate system so i am not sure whether i should put g as 9.81 or -9.81. Your help is needed. Thanks
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Old   November 21, 2002, 05:18
Default Re: Coordinate System
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Erwin
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Your gravity is in -Y direction, so fill in -9.81. It doesn't matter in which quadrant you make your grid, +Y still goes up, -Y still goes down.

To see for yourself: read the grid into Fluent. Display the grid. Under Display/Options menu, turn on the 'Display Axis' option. Look at your grid. Decide in which direction gravity acts.
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Old   November 24, 2002, 01:53
Default Re: Coordinate System
  #7
mahdi saniee nezhad
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Dear sir I have a problem with this title. If it's possible for you please send me your received responses. Very thanks for your attention to my request. With the best regards. Mahdi saniee nezhad

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Old   November 26, 2002, 10:50
Default Re: Coordinate System
  #8
Pravesh Kumar
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Dear Erwin I can't find 'Display Axis' panel as told by you.I am using fluent6.Plz elaborate. Under Display/Options menu, turn on the 'Display Axis' option.

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