velocity magnitude and direction!!

 Register Blogs Members List Search Today's Posts Mark Forums Read

 April 30, 2014, 16:12 velocity magnitude and direction!! #1 Senior Member   Astio Lamar Join Date: May 2012 Location: Pipe Posts: 169 Rep Power: 6 Hello everybody. I have a problem to set the velocity inlet boundary condition in form of "velocity magnitude and direction". I want to introduce 2m3/s to my domain. So by having the inlet area I did the following: 2/inlet area = inlet velocity. When this value assigned in the form and velocity, normal to boundary, I got the correct volume flow rate at the inlet. But since the inlet velocity is not normal to boundary, I set the direction: X-component of Flow Direction: 0.5627 Y-component of Flow Direction: 0.8267 then I got 1.65 m3/s in the inlet!! Does anyone know what is the problem? why it is so? and what is the solution? thanks.

 April 30, 2014, 17:44 #2 Member   Behrooz Jamshidi Join Date: Apr 2013 Posts: 77 Rep Power: 5 Hi According to your data i think your inlet face normal vector is in y direction. When you say for normal velocity it is correct but for non normal velocity its not, this shows that Q/inlet area=inlet velocity is not a scalar equation its a vectorial equation. For having 2m3/hr at face, you should set a volume flow rate so that its y (normal vector direction of your face) component equals 2m3/hr. Regards asal likes this.

 May 1, 2014, 05:14 #3 Senior Member   Lucky Tran Join Date: Apr 2011 Location: Orlando, FL USA Posts: 1,298 Rep Power: 20 As the person before me suggested, the x,y,z-component of flow direction are the scalar components of the flow vector. Each of those components carry the units (default is m/s). Depending on which plane your inlet lies in, you need to specify the right x or y component velocity to get the desired volumetric flowrate. And then specify the other component to get the desired direction. asal likes this.

 May 2, 2014, 03:12 #4 Senior Member   Astio Lamar Join Date: May 2012 Location: Pipe Posts: 169 Rep Power: 6 Hello and thanks for your reply. @ LuckyTran: Would you please advice how can I set the correct x and z component of velocity to have 2m3/s flow rate on the inlet? degree = 30 Last edited by asal; May 6, 2014 at 11:31.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post kenzosenzo FLUENT 17 March 31, 2014 07:03 Brendan FLUENT 0 March 24, 2014 07:24 Yr0gErG FLUENT 3 June 12, 2013 02:12 newOFuser OpenFOAM 1 December 19, 2011 19:34 chong chee nan FLUENT 0 December 29, 2001 06:13

All times are GMT -4. The time now is 16:12.