# ANSYS FLUENT – Dynamic Mesh

In this website, we share a tutorial about Dynamic Mesh, that’s easy and you can find the files in the link below.

It is important that you are familiar with UDFs (User Defined Function) in these videos you can see a brief explanation of this topic. In addition to this, if you have problems to compile the UDF file, please I suggest you should see this video before starting this tutorial: Compilated UDF

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1. Hello CFD Ninja, I’m do my thesis with a air valve, this valve expel air trough a short section where the element regulator of expulsion is a flotator, i need simulated this case, but i cant create the dynamic mesh.

Can you help me please ..?

2. i want dynamic mesh udf file. could you send to my email

• Hi my friend; the file is in this website (up video, say: Download File). Regards

3. Hello my friend. I wonder if there is possible to create a dynamic mesh with 3D geometry.. I’m trying to simulate the flow in a stirred tank..

Regards

4. HI CFD NINJA…I AM TRYING TO SIMULATE THE MOTION OF A WATER(BOTTLE) ROCKET
CAUSED BY ITS ON THRUST(EJECTION OF WATER & AIR) AND GRAVITY USING EXPLICIT VOF ,DYNAMIC MESH AND 6 DOF UDF.WITHOUT 6DOF MOTION THE PROBLEM CONVERGED EASILY BUT WHEN I ACTIVATED MOTION(DYNAMIC MESH & 6DOF),PRESSURE INSIDE BOTTLE BECAME TOO HIGH(EXPONENT POWER OF TENS)..WHAT COULD THE PROBLEM BE!!..ANY HELP WOULD BE GREATLY APPREACIATED…TQ

5. Hi sir. I do this project with another geometry (a tank 50m*30m) but in dynamic mesh I had an error. The total mesh is not remeshing and the ball fall down in the rigid mesh and not reformed mesh and remesh.. Can help me?? Thanks

• Hi friend, please check that Remeshing option is enabled. Regards

• It is enabled but not work. In the geometry I have 2 surface. One surf is between ball and interior line and other surf is other face. Is the not remeshing refer to it???

6. Please take the introduction of geometry and meshing toturial for this post… Thankssss

• Hi friend I will try. Regards

• Thanks sir.. If it be soon very well

• Hi friend I will try. Regards

8. H sir. I do this toturial with another diameter 50*30 m. I do same introduction about your toturial. I had an error. Amg solver error and turbulent viscosity. Help me please

9. Hi. I have this error ‘devergence detected in mag solver:pressure correction… How solve it??? Thanks

10. Hello CFD Ninja, I’m trying to simulate this same problem using Fluent V18.0 but it seems like it does not reproduce well the behaviour of the cylinder.
With this version I dont need to use UDF functions, can you help me?

• Hi friend, UDF function help for faster analysis, however you can insert data without it, remember that you need the inertial moment for your cylinder otherwise the behavior will be different. Regards

11. Hello, I have a problem, how can I calculate the inertia tensor (Ixx, Iyy, Izz) for the same example but having a sphere of 13 mm and finding it in the center of coordinates, in this case the box is a rectangle, for I can have more displacement since I want to calculate the terminal velocity. It is a steel sphere of 1780 density. What is the formula? And what would my mass be if I consider a 2D plane?

• Hi friend, You can find several websites for calculate inertia tensor that is theory, I remember that I have seen free calculators online, if you consider 2D the volume in axis Z = 1 and with density you can calculate the mass.
Regards

• Would you be working with a 2D circle, that is, would you use the formula of the inertia tensor for a solid sphere or for a disk? Is that the inertia tensor depends on the geometry and I do not know if I should consider a solid sphere or a disc, what do you consider? … By the way, how do you define the fluid to be in the middle of the container?

12. I am doing the motion analysis of body in that I have to use only heave and pitch motion. All other motions I need to fix. Can I get the UDF for that?

13. I want to digitally simulate the development of stenosis using dynamic-mesh

14. hello cfd ninja. I want to simulation vortex induced vibration. please help me. or teaching by movie. thankyou

15. Dear CFD Ninja,

I am trying to simulate the dropping object onto water using Ansys CFX (2-way FSI). Could you please teach me how to set up the model, especially meshing the free surface?

16. Hello cfdninja

would you please tell us the procedure of creating the geometry, I do not understand how should I create the geometry. I think think this problem is very common and other people asked you to explain it.

thank you very much

• Hi friend;
I will try, thanks for the suggestion.
Regards

17. Hi CFD Ninja, Can you make a tutorial videos about Dynamic Mesh on train passing each other simuation using ANSYS Fluent ? My final project about this topic, so i hope your tutorial will be usefull

• Hi friend;
Regards

18. I am not able to compile the code properly.
The error reads: The UDF library you are trying to load (libudf) is not compiled for parallel use on the current platform (win64).\n\nThe system cannot find the file specified.
\n\nC:\Users\HP\Desktop\Dynamic Mesh\libudf\win64\2ddp_host\libudf.dll
Error Object: #f