Ansys Fluent: Moving Wall On A Water Tank Using Dynamic Mesh.

This video shows how to simulate a 2D multiphase fluid (air and water), driven by a moving wall with a sinusoidal movement.
This is de UDF i used:
#include "udf.h"
DEFINE_CG_MOTION(moving_wall,dt,vel,omega,time,dtime)
{
real t = CURRENT_TIME;
NV_S (vel, = , 0.0);
vel[0] = 0.35*3.1415*cos(3.1415*t);
}
#Ansys #AnsysFluent #CFD #AutoDeskInventor

[@moel352]

Hi, thank you for sharing your experience, it is very amazing. I have tried the method on my simulation which is a 3D model, but it did not work. Can you help me?

[@cfdem]

Hi, Nice work. I have some questions,
i. What are the boundary conditions on the wall? (no slip, slip)
ii. What are the mesh size on and around the wall?

[@user-fh5wl6rv4v]

7:32 dynamic mesh zone

[@elisawylie7509]

Hi, great video thank you for sharing. Quick question, in your UDF, does 0.35 represent the amplitude or the max velocity? thanks :)

[@benlloyd7241]

amplitude

[@JohnLocke-oi1ym]

can you help with a conventional gearbox... simple transmission of 2 gears

[@m.kharun9494]

Hi, thanks to u, very impressive! I think the moving wall is moved due to linear motion (here sinusoidal motion) am i rite? What about if the wall move due to force or pressure? Like in syringe motion due to force applied.

[@fluentsetup1232]

That actually would be interesting, I'll keep it in mind for future videos

[@josephwakim85]

HELLO, I AM FACING NEGATIVE CELL Volume detected, how to fix it please

[@noraishahothman4394]

hi, tqvm. I try to emulate the steps. However, after conversion from 3D to 2D in DM (previously, I used Spaceclaim to create thickness) and updated the system, Mesh was unable to tag the geometry. What should I do? At present I used student version 2021R2. Pls help. Thank you!

[@fluentsetup1232]

This is one of those times where my bad english comes into play, What do you mean by 'unable to tag the geometry'?

[@noraishahothman4394]

@@fluentsetup1232 there was no geometry exported to mesh..it was unable to process after conversion of 3d to 2D

[@fluentsetup1232]

Check if the 2D geometry you created is in the XY plane, if it isn't the program won't process it. That would be my first guess.

[@modijikiclass]

Thank You for the video, Can you please help me in compiling the UDF ? I am getting an error.

[@modijikiclass]

Error: The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform (win64).

The system cannot find the path specified.


G:\Moving wall\case 1_files\dp0\FFF\Fluent\libudf\win64\2ddp_host\libudf.dll
Error Object: #f

[@fluentsetup1232]

This may sound like a silly question but it is a common mistake: Did you press the 'build' and 'load' buttons like it's shown in the video?

[@modijikiclass]

@@fluentsetup1232 yes I did. It seems like there is some setup issue.

[@datphan8798]

Can you share the code UDF ???

[@fluentsetup1232]

Just added it to the video description!

[@santiagosilva7220]

hey, how are you? its possible to contact you via mail? i have a couple of questions about the UDF, how to create and how to manage for another equations and situations, thank you for ur help :)