velocity contour

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March 9, 2013, 14:18
velocity contour
#1
Member

Rohit kumar Mittal
Join Date: Sep 2012
Posts: 41
Rep Power: 7
Hi guys,
i have a semi circular shaped open channel. I had setting up fluent, but it is not giving proper contour profile. It is giving closed contour loops. What is the mistake i have done, can anybody tell because contour lines for it don't have closed loops.
Here i am attaching the profile which i got.
Kindly comment and help me.
Attached Images
 velocity contour for semi circular open channel.jpg (64.2 KB, 27 views)

 March 9, 2013, 15:03 #2 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,534 Rep Power: 25 What kind of open channel flow reaches 5000 m/s? Are you sure that there is no mistake in your setup? How did you specify the "open" boundary?

 March 11, 2013, 04:07 #3 Member   Rohit kumar Mittal Join Date: Sep 2012 Posts: 41 Rep Power: 7 I don't know about what kind of channel reaches a speed of 5000 m/s. Simply i selected a channel having semi circular cross section. While giving boundary conditions: for inlet- mixture- flow in z direction top water surface level= 0 bottom water surface level= -2 radius of semi circular channel= 2 flow rate of water= (wetted area)*(Velocity of water)*(density of water) remaining as default conditions

 March 11, 2013, 15:58 #4 Senior Member   OJ Join Date: Apr 2012 Location: United Kindom Posts: 475 Rep Power: 13 There is something seriously wrong here. Your water is reaching velocities 6 times higher than bullet!!! Check the boundary conditions OJ stuart23 likes this.

 March 15, 2013, 10:08 #5 Member   Rohit kumar Mittal Join Date: Sep 2012 Posts: 41 Rep Power: 7 you are right Mr. bulmer, i did mistake in dimensions. But still i got the closed contours for semi circular channel. I have some doubt regarding modelling. I did the modelling and gave body as fluid in place of solid. In meshing, i gave the named selection to its sides as walls. I doubt that there is something wrong in meshing. Can anyone tell me where i am doing the mistake? Semi circular channel doesn't have all its contours closed.............

 March 15, 2013, 10:53 #6 Senior Member   OJ Join Date: Apr 2012 Location: United Kindom Posts: 475 Rep Power: 13 Can you attach a snap of how you specified boundary conditions? Have you specified the upper surface as free surface/free slip wall? Regards OJ

 March 16, 2013, 06:02 #7 Member   Rohit kumar Mittal Join Date: Sep 2012 Posts: 41 Rep Power: 7 i defined top surface of semi circular channel as a free surface. At inlet i defined it as mass flow inet. Outlet as outflow. remaining as default conditions

 March 16, 2013, 09:36 #8 Member   Rohit kumar Mittal Join Date: Sep 2012 Posts: 41 Rep Power: 7 I have one regarding the open channel flow that should there be any interface between air and water, if yes, how we shall do the modelling and proceed? One thing also how we define the section plane in meshing?

 March 16, 2013, 11:38 #9 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,534 Rep Power: 25 I suggest you have a look at least at the fluent manual before you simulate multiphase flow.

 March 16, 2013, 15:32 #10 Member   Rohit kumar Mittal Join Date: Sep 2012 Posts: 41 Rep Power: 7 Can you mail me fluent manual at rkmittal1108@gmail.com??? I don't have that manual.

 March 17, 2013, 09:40 #11 Senior Member   OJ Join Date: Apr 2012 Location: United Kindom Posts: 475 Rep Power: 13 Here it is: https://www.sharcnet.ca/Software/Fluent12/index.htm Although, since you can access FLUENT, I believe the Help documentation must be installed on your PC. OJ

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