[skbake94]

Hi guys,

I'm a newbie to CFD and I am trying to create a 2D homogeneous isotropic turbulence using ansys fluent. Is there any documentation or tutorial I can follow or does anyone have suggestions on how to set up the simulation?

Thanks,

[LuckyTran]

Just make a box and give it periodic boundary conditions. Generate a cartesian grid 256x256, 512x512, or whatever resolution you desire. DNS is very easy, it's just very expensive.


The fluent tutorials will teach you how to do way more complicated things, you should get the hang of it probably after doing the first three tutorials.

[Martin_Sz]

Setting up a simulation for 2D homogeneous isotropic turbulence (HIT) in Ansys Fluent requires defining a specific flow condition. While Fluent itself may not have a pre-configured template for HIT, you can achieve this by following these steps:
1. Domain and Mesh:
* Create a periodic domain (cyclic boundary conditions) to represent an infinite fluid volume.
* Use a uniform mesh to avoid introducing any geometric influences on the turbulence.
2. Material Properties:
* Set the fluid material to be incompressible (density remains constant) and inviscid (zero viscosity).
3. Initial Conditions:
* Initialize the velocity field with a random fluctuating component superimposed on a mean velocity of zero. You can use user-defined functions (UDFs) to generate random velocity fluctuations.
4. Boundary Conditions:
* Since the domain is periodic, all boundaries should be set as periodic.
5. Solver Settings:
* Use a pressure-based solver with appropriate discretization schemes for momentum equations.
* Employ Reynolds-Averaged Navier-Stokes (RANS) equations with a turbulence model (although not strictly necessary for HIT since the flow is inviscid). You can disable the viscous terms in the RANS equations using UDFs.
Tutorials and Resources:
Here are some resources that can guide you through setting up a CFD simulation in Ansys Fluent:
* Ansys Fluent Documentation: The official Ansys Fluent documentation provides detailed information on setting up various types of CFD simulations, including user-defined functions (UDFs).
* OpenFOAM Tutorials: While not directly related to Ansys Fluent, tutorials for setting up HIT simulations in OpenFOAM (a similar CFD code) can provide valuable insights into the concepts involved. Search for "OpenFOAM 2D Homogeneous Isotropic Turbulence Tutorial".
By combining these steps with the provided resources, you can successfully set up and run a simulation for 2D homogeneous isotropic turbulence in Ansys Fluent. Remember to carefully consider the specific requirements of HIT when defining the flow conditions and turbulence model.

[skbake94]

Thank you som much for your help guys. I will start working on it with your valuable advice.