Learn how to use Dynamic Mesh Motion in Ansys Fluent to model a fluid domain with deforming or moving mesh boundaries for CFD simulation or fluid-structure interaction analysis. What the challenges are and how this feature helps in overcoming them.
Moving Mesh Simulation Challenges
Modeling deforming meshes in engineering simulations presents significant challenges that affect both accuracy and reliability. Maintaining mesh quality is vital, particularly under complex boundary conditions, to prevent numerical errors. This requires careful consideration of mesh density, element shape, and distribution to ensure the mesh remains well-structured and less distorted. Achieving numerical stability is crucial for convergence and precise outcomes when simulating fluid domains with moving meshes. Robust numerical methods are essential to handle dynamic adjustments without compromising accuracy. These challenges are intensified in scenarios involving rapid deformations or complex fluid-structure interactions, where the mesh must adapt to both fluid flow and structural deformation. Additionally, high-fidelity dynamic mesh simulations demand substantial computational resources and time, as well as effective optimization of mesh motion parameters.
Ansys Solution
Ansys Fluent provides a comprehensive solution for challenges involving moving meshes, allowing engineers to accurately model fluid domains with dynamic or deforming boundaries. This capability is particularly beneficial in applications such as aeroelasticity, internal combustion engines, and biomechanics.
The Dynamic Mesh Motion in Fluent enables the simulation of complex scenarios by automatically adjusting the mesh to accommodate changes in boundary shapes and positions. This ensures the integrity of the simulation while delivering reliable and precise results. Fluent uses dynamic meshing techniques, such as remeshing, layering, and smoothing, to provide a range of strategies for adjusting the moving mesh to the forces or moments acting on moving boundaries, or to cylindrical shapes, or to detecting contacting surfaces. Therefore, engineers have different options for implementing dynamic mesh motion and effectively simulating moving meshes in CFD analysis.
Layering method for deformable meshes:
Remeshing and smoothing techniques for mesh motion:
Dynamic Mesh Motion in Ansys Fluent
To configure dynamic mesh motion in Ansys Fluent, users should first select the appropriate mesh motion methods and options. Next, they need to identify the mesh zones and assign appropriate motion conditions, such as rigid body motion or deformation. A profile or User-Defined Function (UDF) is necessary to specify the motion for the mesh zones. Finally, it is important to display and preview the mesh motion before starting the simulation to ensure that the mesh elements do not become excessively distorted and maintain high quality. The main steps for setting up a moving mesh in Fluent are as follows:
- Choose moving mesh method and global settings
- Add dynamic mesh options
- Define motion for mesh zones
- Preview mesh motion
The figures below illustrate the steps for implementing dynamic mesh motion in Fluent simulation.
This video provides a detailed explanation of the aforementioned steps for dynamic mesh motion in Fluent, including examples of moving mesh using layering, smoothing, and remeshing techniques.
The second video demonstrates a detailed walkthrough of applying dynamic mesh motion in a CFD simulation example using Ansys Fluent.
The third video illustrates examples of vertical, horizontal, and general planar mesh motion, including the necessary profiles for defining these motions.
Ansys Solution Benefits
The dynamic mesh motion feature in Ansys Fluent offers numerous benefits by enabling accurate simulation of complex fluid-structure interactions and transient flow phenomena, which is crucial for industries requiring precise modeling of moving boundaries for product development and optimization. Designed to be user-friendly, Ansys Fluent's dynamic mesh motion tools allow engineers to efficiently set up and run simulations, with advanced algorithms ensuring seamless mesh adaptation to changes while maintaining numerical stability and accuracy. To maximize effectiveness in industrial CFD simulations, it is essential to start with a high-quality initial mesh, define carefully motion parameters, and monitoring regularly mesh quality during the simulation.
Ozen Engineering Expertise
At Ozen Engineering, Inc., we leverage our extensive consulting expertise in CFD, FEA, optics, photonics, and electromagnetic simulations to help clients effectively utilize Ansys Fluent's dynamic mesh motion capabilities. Our team of experienced engineers provides comprehensive consulting services, ensuring that clients achieve accurate and reliable simulation results.
We offer tailored solutions and training services to meet the specific needs of our clients, helping them overcome the challenges associated with dynamic mesh simulations. By partnering with Ozen Engineering, clients can enhance their simulation capabilities and drive innovation in their respective industries. For more information, please visit https://ozeninc.com.
YouTube videos:
Dynamic Mesh Motion in Ansys Fluent - Part 1: https://youtu.be/4nFYwgmSkQM
Dynamic Mesh Motion in Ansys Fluent - Part 2: https://youtu.be/q8A4l2jsq5k
Dynamic Mesh Motion in Ansys Fluent - Part 3: https://youtu.be/isaXu2GsYS4
The Fluent model file: Ozen_Dynamic_Mesh.cas.h5
Suggested blogs on Fluent meshing:
Enhancing CFD Meshing with Geometry-Based Mesh Adaptation: https://blog.ozeninc.com/resources/enhancing-cfd-analysis-with-geometry-based-mesh-adaption