March 24, 2020 at 2:20 amPrudvirajSubscriber
Dear sir, I am working on water flowing over the cylinder using 2D VOF multiphase flow transient model......I want to calculate water falling film thickness over the cylinder. please, someone, suggest a way to find water film thickness using CFD Post pro/plot/any other way.
Your support will be highly appreciated.
March 24, 2020 at 4:16 amKeyur KanadeAnsys Employee
As ANSYS Staff, we can not download attachments. Please insert images using insert image functionality.
if it is cylinder, you may need udf. experts may comment on this.
also moving this to fluid dynamics category to get better response.
If this helps, please mark this post as 'Is Solution' to help others.
March 24, 2020 at 5:46 amPrudvirajSubscriber
Thanks, KKanade, please find the attached image for your reference.
March 26, 2020 at 3:35 am
March 26, 2020 at 6:08 amPrudvirajSubscriber
One of my friends suggested by creating the radial rakes there is a chance to find film thickness...can you please elaborate about radial rakes and suggest an alternative to find film thickness.
March 26, 2020 at 5:11 pmRobAnsys Employee
Try creating an iso-surface to pick up the free surface and then plot "Cell Wall Distance", it's in the Mesh field of contours.
March 27, 2020 at 11:43 amPrudvirajSubscriber
Dear rwoolhou sir, please elaborate, how to draw isosurface and to find cell wall distance??
March 27, 2020 at 12:05 pmRobAnsys Employee
Click on help and review the Fluent tutorials, that'll show you how to create surfaces and the the cell wall distance, look in the field options in contours.
March 28, 2020 at 7:01 amPrudvirajSubscriber
Dear sir, please elaborate......i want to calculate film thickness with respect to circumferential angle...........
March 31, 2020 at 1:00 pmPrudvirajSubscriber
The response from the staff is very poor and totally disappointed. I have posted 1 week back still I did not get any appropriate solution.
March 31, 2020 at 1:32 pmRobAnsys Employee
No, I told you how to find the answers 4 days ago. Maybe do the tutorials?
April 4, 2020 at 4:53 amPrudvirajSubscriber
Dear sir, How can I find film thickness with reference to the circumferential angle.
April 4, 2020 at 7:09 amDrAmineAnsys EmployeeBe patient and check what my colleague suggested. He suggested you create iso surface of volume fraction = 0.5 and fimrom that surface you get with the variable cell wall distance the thickness of the film.
You can create some rakes and also plot along the rakes the radial distance to the free surface after creating some custom field functions and checking the cell zone condition axis and center if rotation.
April 6, 2020 at 4:05 amPrudvirajSubscriber
Dear sir thanks for your suggestions, yesterday in one research paper I read regarding film thickness to be determined in CFD post only...I am attaching related data and how they measured including with image...please suggest me I am not getting....
The corresponding mass flow rate to its velocity inlet is then recorded when a proper film distribution is achieved in simulation result. The thickness of water sheet film on tube surface is then measured based on angles of 15°, 30°, 45°, 60°, 75°, 90°, 105°, 120°, 135°, 150°, and 165° as shown in figure 8. These angles have been set as a reference values in accordance with many previous references. The numerical results have been analyzed in CFD-Post where 4 mm length of measurement lines were positioned normal to tube surface. These measurement lines acted as a parameters that measures water film thickness at specified angles as shown in Fig.
The thickness of water film are extracted and plotted in a graph of thickness versus orientation angles. Each measurement data is measured by taking into account the difference of water volume fraction length which only 1.
Dear sir, please elaborate above procedure applicable to my problem using CFD POST.....
Your support will be highly appreciable....
April 6, 2020 at 5:21 amDrAmineAnsys EmployeeI will lock this topic you raised the same question one more time.
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