Question about velocity vectors

kbaker · June 10, 2011, 08:52

Hi to all I need to plot velocity vectors as curves instead of vectors using the option display>vectors is this can be done?

skullCFD · June 10, 2011, 14:34

Why not use streamlines if you want curves?

kbaker · June 11, 2011, 03:55

I use velocity vectors because I want to see the velocity profiles in every section of the pipe as curves I think streamlines cannot show the velocity profiles?

skullCFD · June 14, 2011, 18:36

Velocity vectors are tangential to the streamline curves. So streamlines show the direction in which the fluid is moving. If you like to have vectors, you can increase their number (depending on your memory) and decrease their size proportionately to capture the flow profile in the curved sections of the pipe. This is how people make recirculation etc. display.

kbaker · June 15, 2011, 05:43

OK how I can use streamline option? I cannot find similar option for it? Is it available in display menu?

skullCFD · June 15, 2011, 17:47

I remember Display->Contours->Velocity->Stream Function. I am unable to verify it now as my simulation is running and it takes almost 15 minutes to stop and restart it again. Sorry about that. Also, streamlines might work only for 2D simulations in Fluent. If yours is 3D, may be path line is a better option (http://jullio.pe.kr/fluent6.1/help/html/ug/node950.htm).

June 10, 2011, 08:52	Question about velocity vectors	#1
kbaker Senior Member Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 168 Rep Power: 17	Hi to all I need to plot velocity vectors as curves instead of vectors using the option display>vectors is this can be done?

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June 10, 2011, 14:34		#2
skullCFD Member Join Date: Apr 2011 Posts: 30 Rep Power: 15	Why not use streamlines if you want curves?

June 11, 2011, 03:55		#3
kbaker Senior Member Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 168 Rep Power: 17	I use velocity vectors because I want to see the velocity profiles in every section of the pipe as curves I think streamlines cannot show the velocity profiles?

June 14, 2011, 18:36		#4
skullCFD Member Join Date: Apr 2011 Posts: 30 Rep Power: 15	Velocity vectors are tangential to the streamline curves. So streamlines show the direction in which the fluid is moving. If you like to have vectors, you can increase their number (depending on your memory) and decrease their size proportionately to capture the flow profile in the curved sections of the pipe. This is how people make recirculation etc. display.

June 15, 2011, 05:43		#5
kbaker Senior Member Khalid Baker Join Date: Mar 2009 Location: IRAQ Posts: 168 Rep Power: 17	OK how I can use streamline option? I cannot find similar option for it? Is it available in display menu?

June 15, 2011, 17:47		#6
skullCFD Member Join Date: Apr 2011 Posts: 30 Rep Power: 15	I remember Display->Contours->Velocity->Stream Function. I am unable to verify it now as my simulation is running and it takes almost 15 minutes to stop and restart it again. Sorry about that. Also, streamlines might work only for 2D simulations in Fluent. If yours is 3D, may be path line is a better option (http://jullio.pe.kr/fluent6.1/help/html/ug/node950.htm).