Pressure/Density Gradient

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 October 6, 2013, 22:44 Pressure/Density Gradient #1 New Member   TX-Texas Join Date: Oct 2013 Posts: 10 Rep Power: 6 Is there a way to plot either pressure or density gradients in Fluent (Fluid)? Or obtain values for for pressure and density derivatives in respect to x, y and z directions, such as dp-dx, dp-dy and dp-dz?

 October 8, 2013, 11:36 #2 Senior Member   Gonzalo Join Date: Mar 2011 Location: Argentina Posts: 120 Rep Power: 9 yes, go to Plots under Results, then under Y Axis Function choose derivatives and the tipe of Derivative you want. Also yo have to select the lines over wich you want to calculate the gradients. Hope this helps you. Regards. Gonzalo AshwaniAssam and hicabiye like this.

 October 9, 2013, 10:43 #3 New Member   TX-Texas Join Date: Oct 2013 Posts: 10 Rep Power: 6 Dear gfoam, I do not see the "derivative" options under the "Y Axis Function." Do you think that I might be missing particular inputs?

 October 9, 2013, 13:42 #4 Senior Member   Gonzalo Join Date: Mar 2011 Location: Argentina Posts: 120 Rep Power: 9 I don't know why you can't see that, but here you can see an image of it: derivatives.png hicabiye likes this.

 October 13, 2013, 20:13 #5 New Member   TX-Texas Join Date: Oct 2013 Posts: 10 Rep Power: 6 Dear gfoam, Derivatives is still missing from that section. I do not see it as one of my options. Do you think that I might be missing something in the setup stage? Since it is not working, is it valid to say that density in respect to the x direction is drho-dx since it is discretized?

 October 15, 2013, 06:47 #6 Senior Member   Gonzalo Join Date: Mar 2011 Location: Argentina Posts: 120 Rep Power: 9 Hi, I'm confused. If you solved your problem (I mean, if you press Calculate and let the software run) you must see the Results/Plots task page. There you can find the derivatives of velocity and pressure, but there isn't a derivative of density. To plot the derivatives of density you can use CFDPost, but I don't how you can do this in that software. Another option you can use is, export the density along the line you want to, and numerically find the derivatives in a spreadsheet. i hope this helps you. Regards. Gonzalo

December 5, 2013, 22:17
#7
New Member

TX-Texas
Join Date: Oct 2013
Posts: 10
Rep Power: 6
Dear gfoam,

I went ahead and exported the pressure and density data to discretize them as dp/dx and drho/dx; however, I have no idea why derivatives do not show up (see figure). Do you happen to know why?
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 Tags ansys, density, fluent, gradient, pressure

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