Is it a valid approach to create a cylindrical fluid zone encompassing the blades and employ a moving mesh zone technique in ANSYS Fluent to rotate the cylindrical fluid zone instead of directly simulating the motion of the blades? I am particularly interested in conducting a transient simulation using ANSYS Fluent and obtaining the moment on the vanes.
Is there any other approach to do the simulation better if calculating the moment wrt time is the prime objective?
I think that the Moving Reference Frame (MRF) method, which can be easily implemented in Ansys FLUENT by dividing the whole domain in sub-regions is the simplest and accurate way.
Obviously, by doing this You are disregarding aeroelastic effects that can eventually influence Your results.
However, MRF is very accurate...please see the following paper, where a comparison with experiments has been made:
Article 3D CFD Simulation and Experimental Validation of Small APC S...
Please note that Authors create an external box domain to prevent upstream conditions to influence results.
In addition, there is a link to the official guide about MRF:
https://www.afs.enea.it/project/neptunius/docs/fluent/html/th/node33.htm
Best regards,
AP
Yes, employing a moving mesh technique in ANSYS Fluent to rotate a cylindrical fluid zone around the blades is a valid approach for simulating the motion of rotating machinery, such as turbines or impellers. This method allows you to avoid directly simulating the detailed motion of individual blades, which can be computationally expensive and time-consuming.
By creating a cylindrical fluid zone that encompasses the blades and applying a rotating motion to that zone using a moving mesh technique, you can effectively capture the influence of the rotating blades on the fluid flow. This approach simplifies the simulation and reduces the computational cost compared to simulating the actual blade motion.
When it comes to calculating the moment on the vanes, using a moving mesh approach can provide reasonable results. The moment on the vanes is a measure of the torque exerted by the fluid on the blades, and by capturing the overall fluid behavior accurately, you can obtain reliable moment values.
However, it's important to note that the accuracy of the results will depend on several factors, such as the complexity of the flow field, the mesh resolution, and the specific boundary conditions. It's always recommended to perform validation studies and compare your simulation results with experimental data or analytical solutions, if available, to ensure the accuracy of your approach.
In terms of alternative approaches, if calculating the moment with respect to time is your primary objective, you can also consider using a sliding mesh technique instead of a moving mesh technique. The sliding mesh approach allows the blades to have their own independent motion, which can be more accurate in capturing blade interactions and blade-to-blade flow phenomena. However, sliding mesh simulations can be more computationally demanding compared to moving mesh simulations.
Ultimately, the choice of the simulation approach will depend on the specific requirements of your problem, the available computational resources, and the desired level of accuracy. It is always recommended to consult the ANSYS Fluent documentation, relevant literature, and seek expert advice in your specific field of application for guidance on the most suitable approach.
- Badges
- Science topic
- Similar topics
- Engineering
- Modeling