# Pls answer my simple doubt concerning pathlines

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 March 10, 2009, 13:08 Pls answer my simple doubt concerning pathlines #1 Jig Guest   Posts: n/a Sponsored Links I wanted to INCREASE the number of pathlines as in I want to make them more dense ..... i have gone through the Fluent User guide but have not found anything yet ..... I wanted to make them more dense so that i can clearly see the pathlines near the airfoil .... as of now just 2 pathlines are going near my airfoil ..... I cannot use velocity field because I wanted to animate using pathlines ..... pls help me/. thanks in advance.
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 March 11, 2009, 09:15 Re: Pls answer my simple doubt concerning pathline #2 Novice Guest   Posts: n/a Hi, I think you have to increase the number of steps in the pathlines definition panel. Regards, Novice

 March 11, 2009, 12:20 Re: Pls answer my simple doubt concerning pathline #3 Jig Guest   Posts: n/a thanks but I have tried increasing steps it doesnt work ...... changing steps just increase/decreases the motion along x direction. I could use velocity field as they are quite dense but I cannot animate using them ... Or can I ? does anyone know how to animate using velocity field? Pls help me . i just want my first fluent simulation to be readY! thanks.

 March 11, 2009, 14:03 Re: Pls answer my simple doubt concerning pathline #4 sa Guest   Posts: n/a you have make the axial plane from where you can release pathlines

 March 12, 2009, 05:10 Re: Pls answer my simple doubt concerning pathline #5 hervĂ© Guest   Posts: n/a Are you trying to visualise the flow in a separation/recirculation zone? If yes, you 'll never get the pathline in this area, if you inject them from the upstream inlet. By definition, a separation zone is a "dead" zone, therefore no "fresh" fluid visits it. To visualise a separation/recirculation zone, the pathlines should not be injected from the inlet, but from a vertical median plane, which should contain the airfoil and the separation zone. Indeed, the number of steps should be reduced (15 max, for instance), and because of the large number of cells concerned by the injection (it is a whole plane now, and no more just the inlet), I recommend to use the "path skip" function (says 5 for instance) to reduce computation and time of display. Hope it helps.

 March 12, 2009, 10:23 Re: Pls answer my simple doubt concerning pathline #6 Jason Guest   Posts: n/a Create a rake upstream of your airfoil. A pathline will be released from each point on the rake, so how ever many points you specify on the rake will determine how many pathlines you get. Pathlines are released from each node on the surface you release the pathlines from. If you only get 2 pathlines that implies that either the pathlines can't be calculated (poor choice in surface to release from, or problem with overall setup) or you have an extremely coarse mesh. Good luck Jason

 March 12, 2009, 11:28 Re: Pls answer my simple doubt concerning pathline #7 Jig Guest   Posts: n/a thank you ..... I am trying to simulate steady incompressible flow through an airfoil...The plots are all fine .... I just wanted to make an mpeg file of the animation ... I am releasing the pathlines from the inlet surface..... The problem is that the pathlines are released at a distance of 1 cm from each other and I just wanted to reduce this distance .... my airfoil is imported from NACA0012 'dat' file... coordinated vary from 0 to 1 along x....

 March 12, 2009, 11:42 Re: Pls answer my simple doubt concerning pathline #8 Jig Guest   Posts: n/a thank you ..... I am trying to simulate steady incompressible flow through an airfoil...The plots are all fine .... I just wanted to make an mpeg file of the animation ... I am releasing the pathlines from the inlet surface..... The problem is that the pathlines are released at a distance of 1 cm from each other and I just wanted to reduce this distance .... my airfoil is imported from NACA0012 'dat' file... coordinated vary from 0 to 1 along x....

 March 12, 2009, 11:44 Re: Pls answer my simple doubt concerning pathline #9 Jason Guest   Posts: n/a Create a rake and release from there

 March 12, 2009, 11:49 Re: Pls answer my simple doubt concerning pathline #10 Jig Guest   Posts: n/a thank you I will try that .....

 March 16, 2009, 17:07 #11 New Member   Korenchy Tamás Join Date: Mar 2009 Posts: 2 Rep Power: 0 Hi! I have had the same problem. What I did was an adaptive refinement of the grid az the inlet, thus you get more cells -> more streamlines released -> denser streamlines! But maybe the rake thing is easier..Jason, please, what is a rake, and how do you create one? Cheers, Tamás

 March 16, 2009, 19:55 #12 Senior Member   Micael Boulet Join Date: Mar 2009 Location: Quebec, Canada Posts: 117 Rep Power: 11 Surface -> Line/Rake For "Type" choose rake Then define the two end points of the rake and the number of point to distribute on that rake. Have a nice day. Micael

 March 16, 2009, 19:59 #13 Senior Member   Micael Boulet Join Date: Mar 2009 Location: Quebec, Canada Posts: 117 Rep Power: 11 DonTomasso, Directly taken from the user guide (27.5 Line and Rake Surfaces): "A rake consists of a specified number of points equally spaced between two specified endpoints." Have a nice day. Micael

 March 17, 2009, 02:14 #14 New Member   Korenchy Tamás Join Date: Mar 2009 Posts: 2 Rep Power: 0 Thank you, have a nice day, too!

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