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-   -   Contours of Velocity Magnitude (http://www.cfd-online.com/Forums/fluent/72575-contours-velocity-magnitude.html)

cfdiscool February 10, 2010 12:15

Contours of Velocity Magnitude
 
Hi

What exactly will be reported by FLUENTS

display----> Contours--->Velocity--->Velocity-Magnitude...

Is it the sum of all the three velocity(x,y,z) components?......

what if the flow is only in one direction say Y and X=0 and Z=0 ? What exactly is then reported my Velocity Magnitude


thank you

nice day

-mAx- February 11, 2010 02:20

Velocity Magnitude = sqrt (Ux**2 + Uy**2 + Uz**2)
If Uy=Uz=0, then VM = sqrt(Ux**2)=Ux

cfdiscool February 11, 2010 06:13

thank you max:)

this explanation is very clear.....

i can see Ux Uy Uz (X-Velocity,Y-Velocity etc...) distinctly .......i mean i can visualize these three components clearly with various contour levels and find velocity variations in my domain.......but when I switch to "Velocity Magnitude" in contour display option ...most of my domain shows deep blue color which is close or equal to 0 m/s......

Does this mean that i do not have any resultant velocity at the end? or doest it mean the resultant velocity is a result of your explanation above.....

-mAx- February 12, 2010 02:15

you should have a place with high velocity in comparison with all your domain. Modify the scale of the VM

Al-Hashimi December 20, 2012 13:39

What is ment by Modify the scale of velocity magnitude? do you kindlly mean to change the velocity to a higher value? whats if the velocity is an inlet velocity boundary condition?

-mAx- January 3, 2013 02:14

Quote:

Originally Posted by Al-Hashimi (Post 398444)
What is ment by Modify the scale of velocity magnitude? do you kindlly mean to change the velocity to a higher value? whats if the velocity is an inlet velocity boundary condition?

I meant: modify upper scale limit (max value)


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