Momentum source value

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 July 31, 2003, 23:42 Momentum source value #1 Jackie Guest   Posts: n/a Hello all, Could anybody Explain how to guess the momentum source value in a tube please. I'm simulaing the flow in an open end tube which has the momentum source inside. I expect 0.1 m/s velocity at the position adding the momentum . I know the cross section area of the tube and the volume of the 3D region of the source and the unit of the momentum source is kg/m^-2s^-2. Does any body have an idea how to guess it ( equation and method ) I'm looking forward to hear the kindly help soon, @T_T@ Thank you in advance. Jackie

 August 1, 2003, 15:20 Re: Momentum source value #2 Robin Guest   Posts: n/a Hi Jackie, The momentum source basically specifies a pressure gradient, however you can modify modify it to get a specific speed. The following settings will do the trick: MOMENTUM SOURCE: Momentum Source X Component = -C*(u-uspec) Momentum Source Y Component = -C*(v-vspec) Momentum Source Z Component = -C*(w-wspec) Momentum Source Coefficient = -C END where C is a very large number and uspec, vspec, and wspec, are the specified velocities. Regards, Robin

 August 1, 2003, 15:57 Re: Momentum source value #3 Jackie Guest   Posts: n/a How could I know C value Robin. Jackie,

 August 2, 2003, 10:01 Re: Momentum source value #4 Robin Guest   Posts: n/a The actual value does not matter, it just has to be a big number. Robin

 August 3, 2003, 10:07 Re: Momentum source value #5 Jackie Guest   Posts: n/a Thank you very much Robin. Jackie

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