August 20, 2019 at 12:24 pmbrmacielSubscriber
I am still very unexperienced with simulation. I tried to simulate a laminar flow of water in a very small conical nozzle, but I get wall shear stress values equal 0 along the nozzle, and then it suddenly goes up to 3000 Pa at the end (end diameter ~0,2um) - image attached. I suppose the shear stress values should be low at the beginning of the nozzle, but definetely higher than 0. What could be causing that?
Thank you very much in advance.
August 20, 2019 at 12:33 pmRobAnsys Employee
To confirm you're modelling a nozzle with diameter 0.2 microns?
August 20, 2019 at 12:37 pmbrmacielSubscriber
sorry, my mistake. 200 microns end diameter = 0.2 mm
August 20, 2019 at 4:11 pmDrAmineAnsys EmployeeIf using Fluent solver please check the value there.
August 21, 2019 at 7:23 ambrmacielSubscriber
thanks for your answer. Value checked.
inlet diameter: 4 mm
outlet diameter: 0.2 mm
Would you have any idea why I am getting zero wall shear stress?
Thanks and best regards,
August 21, 2019 at 9:55 amRobAnsys Employee
Can you plot the contour (or xy plot in 2d) in Fluent and post that? Also post an image of the near wall mesh.
August 21, 2019 at 11:41 am
August 21, 2019 at 12:35 pmDrAmineAnsys Employee
Please XY Plot the wall shear stress value along the wall (You are working 2D contour plot does not make a sense.
August 21, 2019 at 1:42 pm
August 21, 2019 at 2:09 pmRobAnsys Employee
Please can you do the xy plot in Fluent. Also plot a contour of velocity.
August 21, 2019 at 2:37 pm
August 21, 2019 at 3:29 pmDrAmineAnsys EmployeeCan you restrict the plot to smaller range of position? Is your x axis the axis of symmetry?
August 21, 2019 at 3:38 pmbrmacielSubscriber
What range would you like to see?
Yes, the x axis is the symmetry axis.
August 21, 2019 at 3:40 pmDrAmineAnsys EmployeeTo 0.04
August 22, 2019 at 1:24 pmbrmacielSubscriber
If I go to 0.004 in the diagramms, I can see that the shear stress is very low, but not 0. Thanks for the help!
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