July 20, 2020 at 5:16 amchiragthakar29Subscriber
It is a diffuser in it there is a fan
Simulation in ansys fluent
Fan speed = 4000 rpm
Quantities to determine :-
- Pressure variation
- Velocity variation
- Flow animation
- Flow rate generated due to the fan rotation
I am new to the ansys software so I am not much acquainted to it. I have done this simulation in ansys fluent taking the inlet of the diffuser as a velocity inlet and outlet as a pressure outlet.The problem in this is that I am not able to see the result even if all the calculations are completed successfully. I tried to show and contour and streamline but it does not show anything.
I am attaching the iges file of the design.
Please help me!!
July 20, 2020 at 12:24 pmKarthik RAdministrator
As Ansys employees, we are not able to download attachments from these posts. Could you please post the images directly here and we should be able to help?
Are you doing your post processing in CFD post? Or are you using Ansys Fluent for this?
July 20, 2020 at 12:39 pmchiragthakar29SubscriberI have tried in both but it is not showing anything..
July 20, 2020 at 3:59 pmRobAnsys Employee
Please post screen shots of what you're trying to plot & the results.
July 21, 2020 at 5:09 am
July 21, 2020 at 12:01 pmKarthik RAdministrator
Do you have a converged solution? Can you show the residual plot (along with any monitors you might have created) in Fluent? Also, are you able to plot the velocity contour in Fluent?
July 21, 2020 at 2:31 pmchiragthakar29Subscriber
This above shows the method I used.
This type of floating point error occured, than I pressed OK and I got this :-
This are the above residual plot. I don't know whether my solution converged or not .
It shows whole black color. I am not getting what it shows?
This above is the velocity contour, it shows whole blue but in reality it should vary as this is a diffuser. It should be highest in input and lowest in the output and the pressure should be the lowest in input and highest in output.
This is the X-Y plot about plane 5 , it shows nothing..
Please help! I am working on this project and I am in urgent need to do the simulation.
July 21, 2020 at 2:40 pm
July 22, 2020 at 12:04 pmKarthik RAdministrator
Your solution did not converge. You got a floating-point exception error. This is the reason why you are not seeing the results.
What is your mesh quality?
Are you running MRF or sliding mesh analysis? Also, What are your boundary conditions?
July 24, 2020 at 5:37 amchiragthakar29SubscriberIn the above post I have showed the pic of the mesh details. It also contains the mesh quality properties ,please reveiw it. I am new to ansys so I am not aware about the MRF or sliding mesh analysis.
Boundary conditions :-
1) I have defined the surface of the diffuser from which the air will enter as input.
2) The surface of the diffuser from which the air will come out as output.
3) The fan is defined as fan
4) The outer perifery of the diffuser other than the input and output surface as wall.
5) I have taken the input as velocity inlet and output as pressure outlet.
I hope that these are the things that you asked for..thank you for helping me..
July 24, 2020 at 12:58 pmKarthik RAdministrator
Please search for the axial fan tutorial on YouTube. You will find examples very similar to what you are trying to attempt. This should help you get to the right model set-up.
Could you please follow one of these examples and see if you can verify your model set-up? Please note that these are old videos and you might have some convergence issues with these settings. But, this set-up should provide you a good learning experience.
Also, please verify that the min orthogonal quality of your mesh is greater than 0.1 and max skewness is less than 0.9.
July 27, 2020 at 7:11 amchiragthakar29SubscriberThank you for helping.
July 27, 2020 at 11:49 amKarthik RAdministrator
- You must be logged in to reply to this topic.
Simulation World 2022
Check out more than 70 different sessions now available on demand. Get inspired as you hear from visionary companies, leading researchers and educators from around the globe on a variety of topics from life-saving improvements in healthcare, to bold new realities of space travel. Take a leap of certainty and check out a session today here.
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.
- Suppress Fluent to open with GUI while performing in journal file
- Heat transfer coefficient
- What are the differences between CFX and Fluent?
- Floating point exception in Fluent
- The solver failed with a non-zero exit code of : 2
- Difference between K-epsilon and K-omega Turbulence Model
- Getting graph and tabular data from result in workbench mechanical
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- error in cfd post
© 2022 Copyright ANSYS, Inc. All rights reserved.