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**

**Download Files: Dynamic Mesh**

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 ..?

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

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

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

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???

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.please take the toturial introduction of geometry and mesh about this post thanks

Hi friend I will try. Regards

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

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

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

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?