August 6, 2019 at 10:01 ammaaz007Subscriber
Can anyone guide/help me in mesh generation of screw compressor for analysis in ANSYS CFX/FLUENT (which ever feasible for this type of analysis, i dont know which one to use). i am new to ansys.
August 6, 2019 at 1:33 pmpeteroznewmanSubscriber
August 7, 2019 at 12:13 pmmaaz007Subscriber
I have read the discussion and it mentions to use 2D as a starting point but i cant use 2D because in screw compressor the compression is done axially. Please let me know how to mesh the fluid and solid? do i have to subtract the solid from the fluid or i will insert the solid in a FULL fluid (without a screw shaped cavity)?
August 7, 2019 at 1:58 pmpeteroznewmanSubscriber
Did you follow the Immersed Body example in the discussion? You mesh the fluid cavity without the screw and you mesh the screw separately. Doing a 2D model just makes the solution faster and gives you confidence that you know how to build a valid model that runs before you spend the effort on the 3D case.
August 8, 2019 at 7:15 ammaaz007Subscriber
Yes i followed that example but unfortunately the meshing portion is excluded from that example. it only focuses on Preprocessing and onwards. Also is there any method other than immersed body method to carry out this type of simulation?
August 8, 2019 at 9:30 amRobAnsys Employee
You can try overset in Fluent or full moving mesh: neither will be simple. Can you post a couple of images of what you want to model: it's very easy for a poor translation to confuse on here.
August 8, 2019 at 9:55 am
August 8, 2019 at 11:49 amRobAnsys Employee
Immersed solids (CFX) or Overset (Fluent) will be easiest within the solver. Mesh requirements may make it more complicated.
August 9, 2019 at 10:03 ammaaz007Subscriber
I am having a problem with extract volume. when i import this geometry into ansys spaceclaim, it shows the model as a combination of surfaces rather than solid bodies. so the extract volume says it only works for solids
August 9, 2019 at 11:57 ampeteroznewmanSubscriber
Go to the Repair Tab and click the Missing Faces tool to convert a set of faces into a solid.
August 18, 2019 at 6:50 ammaaz007Subscriber
I have run the simulation using immersed solid method by making the 2 rotors as immersed solids but i have a problem. after the solution when i draw streamlines in cfd post, the lines are crossing the rotors i.e. they are not considering it as a solid. i mean how can fluid cross the rotors when i have marked it as immersed solid domain. any ideas?
August 20, 2019 at 10:00 amRobAnsys Employee
I'd suggest starting a new thread in the Fluids section: I don't know and Amine & others tend not to look in here.
August 20, 2019 at 10:17 ammaaz007Subscriber
nevermind. i want to confirm that u told me to go for immersed solids method, does it cater for the compression being taken place due to screw movements as its a compressor.
August 20, 2019 at 12:28 pmRobAnsys Employee
If you've got the geometry gaps correct and set it up then yes, the feature will mimic whatever you're trying to model. Including screw pumps etc. If you plot pressure contours can you see that?
August 20, 2019 at 12:44 pmmaaz007Subscriber
i have two concerns regarding this:
1- the pressure rise shown in contours is neglible where as a high value was expected.
2- the ANSYS CFX Solver modelling guide tells that immersed solid doesnt cater for the compression effects very well and also not works with total energy or thermal energy models. but i have to enable the total energy model otherwise how would the compression be taken into account by the solver?
August 21, 2019 at 9:44 amRobAnsys Employee
As there's a thread in fluids I've copied your post there. I can't answer this (I don't use CFX enough) and Amine tends not to look in here, as I mentioned yesterday.
- You must be logged in to reply to this topic.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- ANSYS Workbench Measuring within Design
- how to improve the inflation quality at sharp corners?
- check element type
- The mesh file exporter could not resolve cyclic dependencies in overlapping contact regions error
- How to resolve Mesh Failure
- Meshing Error
- Error in meshing
- Conformal vs Non-Conformal Mesh
- execution error inside the mesher. The process suffered an unhandled exception or ran out of memory
- inflation created stairstep mesh at some location
© 2023 Copyright ANSYS, Inc. All rights reserved.