Mastering Meshing Methods in Ansys Discovery Refine Mode
Hello everyone, this is Mohsen Seraj. I'm a Senior Application Engineer for NCS CFT at Ozen Engineering, Inc. In this video, I will walk you through the different ways we can work on meshing in the Refine Mode in Ansys Discovery.
Introduction to Refine Mode
In Refine Mode, we utilize the Fellow Intermeshing for meshing and the Fellow Solver for CFD simulation. This mode includes several new features:
- Use of a GPU solver known as Live GPU Love GX.
- Inclusion of polyhedral elements alongside tetrahedral meshing.
- No need for remeshing the model when resolving it.
Meshing Process
The model used here is the same as the one from the Explorer Mode, which is part of my blog on Ansys Discovery Meshing. I subdivided the room into different parts, using transparency for areas near the server and the fan.
Global Fidelity Options
In Refine Mode, we have different options for global fidelity compared to Explorer Mode. These include:
- Curvature and proximity settings.
- Fixed size options.
- Local fidelity settings for specific parts of the domain.
Mesh Adjustment
We can adjust the mesh size using a slide bar, which affects the entire domain. For example, increasing fidelity can raise the number of elements from 13,000 to 390,000 and nodes from 5,500 to over 100,000.
Impact of Mesh Size on Results
Mesh size significantly affects results. For instance, velocity magnitude can jump from 0.8 in Explorer Mode to 1.9 in Refine Mode. Similarly, temperature readings can vary between modes.
Curvature and Proximity Meshing
Using curvature and proximity settings, we can capture detailed features without significantly affecting velocity or temperature results.
Local Fidelity
Local fidelity allows assigning specific mesh sizes to parts of the domain. For example, assigning a 200mm mesh size locally can refine the mesh in targeted areas without affecting the entire domain.
Polyhedral Meshing
Refine Mode offers polyhedral meshing as an alternative to tetrahedral meshing. This option reduces the number of mesh elements and solution time while maintaining quality.
Mesh Quality and Statistics
Mesh quality can be assessed using metrics like orthogonality, skewness, and aspect ratio. These metrics help ensure the mesh is suitable for accurate simulations.
Conclusion
By the end of this video, you should understand the meshing options available in Refine Mode, including global and local size settings, and the choice between tetrahedral and polyhedral meshing. These tools allow for precise control over simulation fidelity and efficiency.
Hello everyone, this is Mohsen Seraj. I'm a senior application engineer for NCS CFT at Ozen Engineering. In this video, I'll walk you through the ways to work on meshing in the refined mode in ANSYS Discovery.
In the refined mode, we use face-to-face intermeshing and, for the solution, we use fellow and solver for a CFT simulation. It's like using fellow for meshing and solution in ANSYS Discovery.
New features in ANSYS Discovery in the refined mode include the ability to use a GPU solver, called live GPU GX, and the option for polyhedral elements instead of just tetrahedral meshing. Additionally, you don't need to remesh the model when solving or resolving the model.
In the refined mode, you can control global fidelity with different options compared to the Explorer mode. These options include curvature proximity and carry over, fixed size, and local fidelity. You can assign a specific size for a part of the domain.
In the refined mode, you don't need to solve the model to see the mesh. You can use the slide bar to change the fidelity or mesh size and work on global fidelity, curvature proximity, or local fidelity.
When meshing the domain, you can see the mesh information, including the number of elements and nodes. With high fidelity, the number of elements quickly increases. The mesh size can significantly affect the results.
For example, the magnitude of the velocities can jump from 0.8522 to 1.9 in refined mode. For the temperature, you can see a difference between the Explorer mode and the refined mode. With high fidelity global fidelity, the temperature can return to the original value.
When using curvature and proximity for the global fidelity, the mesh size may not significantly affect the results. This is because the initial mesh with global fidelity automatically sizes the meshing well enough to capture curvature and features.
You can check the mesh inside the domain by using a section plane. You can assign local fidelity to a specific part of the domain and choose a different size for the meshing. In the refined mode, you can use polyhedral meshing instead of tetrahedral meshing.
This can result in a better mesh quality and a reduced number of mesh elements, which can save time in the refined mode. You can check the mesh quality with mesh statistics, including orthogonality, skewness, aspect ratio, and other items.
In the refined mode, you have options for the meshing, including global, local size preview, and simulation options. You can choose between tetrahedral and polyhedral meshing. For solving the simulation, you have the simulation option with different types of expressions.
