# graph of velocity against distance

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 August 10, 2012, 13:02 graph of velocity against distance #1 Senior Member   zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 10 Dear everyone.. I am relatively new to fluent, I had done a 2D simulations of some buildings and i want to plot a graph of velocity against distance.. the problem is that in the drop down menu for surfaces i see a lot of options, hence i am confused...i also see a lot of zones in the drop down menu.. please i really need someone to guide me in that.. thanking you all in advance zay

 August 10, 2012, 17:31 #2 Member   Guiliguili Join Date: Aug 2010 Location: Montréal Posts: 97 Rep Power: 12 Go to Mesh -> Display Then you can select on surface and click on Display to know which surface it. Do it for all surfaces. to understand the relation between the names and the geometry. zaynah04 likes this.

 August 11, 2012, 03:32 #3 Senior Member   zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 10 Thanks You a lot Toure.. it helped.... In my plot now, when i am plotting velocity against distance, what parameter should i normally use for the surface? I mean i want to compare two graphs in my project, hence i am confused on the parameters displayed... thanks in advance

 August 11, 2012, 11:08 #4 Member   Guiliguili Join Date: Aug 2010 Location: Montréal Posts: 97 Rep Power: 12 If you want to have a map color of any variable on a surface such as the pressure : Graphics and animation -> Contours Then select filled in "Options", the variable in "Conours of" and the surfaces in "Surfaces" If you want to plot any variable versus of any other variable on a line (velocity vesus distance) : Plots -> XY Plot Be sure that Position on X Axis and Position On Y Axis are not selected in the "Solution XY Plot" window Click on New surface and select Line/Rake in the "Solution XY Plot" window Draw the line you want to plot in the "Line/Rake Surface" window Draw a line that represent distance for you Close the "Line/Rake Surface" window Then select the variable for X axis and the variable for Y axis in the "Solution XY Plot" window Click on Plot. If you want to export the data of the graph to a file , select "Write to File". Then your "Plot" button become a "Write" button. Click on it and save the plot data to a file. You can reload many files with the "Load" button on the same graph. zaynah04 likes this.

 August 11, 2012, 16:01 #5 Senior Member   zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 10 Thank you a lot Toure.. You told me what i could not find in books.. I am grateful.. zay

 August 11, 2012, 23:20 #6 Member   Guiliguili Join Date: Aug 2010 Location: Montréal Posts: 97 Rep Power: 12 Keep going

 August 12, 2012, 14:42 #7 Senior Member   zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 10 dear toure.. Fluent solve a lot of equations. including the Navier-Stokes one. how do i know which equation solve for example in a laminar flow around a cube or circle? thanks in advance

 August 12, 2012, 15:21 #8 Member   Guiliguili Join Date: Aug 2010 Location: Montréal Posts: 97 Rep Power: 12 I don't understand the question. You chose the equations by selecting a model in Models 1. Models -> Viscous (Inviscid, Laminar or Turbulent models such as k-epsilon and others) 2. You can add heat transfer Models-> Energy (On) 3. ..... zaynah04 likes this.

 August 12, 2012, 15:24 #9 Senior Member   zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 10 i want to knnow all the equations which fluent solve to get the result. example, when i model a cube in laminar flow or turbulent, i iterate and get the result. i want to know which equations did fluent use for that? thanks

 August 12, 2012, 20:22 #10 Member   Guiliguili Join Date: Aug 2010 Location: Montréal Posts: 97 Rep Power: 12 It's ANSYS FLUENT Theory Guide that you need A not too new version but it does change a lot between version 12, 13 and 14 https://www.sharcnet.ca/Software/Flu...df/th/flth.pdf zaynah04 likes this.

 August 14, 2012, 01:16 #11 Senior Member   zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 10 i am using fluent 6.3... but am studying the book.. thanks toure...

 August 14, 2012, 01:36 #12 Senior Member   zaynah K. Join Date: Jun 2012 Location: Mauritius Posts: 138 Rep Power: 10 hi, After i itererate my program ( turbulent) and after convergence is reached , when i display velocity contour i got error messages. "Error message from graphics function Compute_Text_Extent: The device for '/driver/msw/win+w0/inner/scale' doesn't seem to be alive Error: Floating point error: invalid number Error Object: ()" can you Dear Toure please help me out here? Thanks in advance zay Last edited by zaynah04; August 14, 2012 at 14:24.