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February 19, 2017, 15:31 |
Transient 1-way FSI with Ansys
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#1 |
New Member
Leo
Join Date: Jul 2014
Posts: 13
Rep Power: 12 |
Hello everybody,
I am currently having some issues to perform a 1-way transient Fluid-Solid-Interaction. I have simulated a flow inside a fuel cell with CFX and the simulation did really fine. I simulated 150 timesteps, from 0 to 15s, with a step size of 0.1 s. I can visualize it at "Results" in CFX and it seems plausible. Now I would like to analyze the effects of my flow in the walls of the fuel cell. Specially Equivalent, normal and sheer stresses. I imported the results of CFX into the Setup of "Transient Structural". I have now two major problems: 1. No matter what I do, it seems the program only import ONE single time step from CFX. See Figure A attached. 2. At "Analysis Settings" I choose different numbers for "Number of Steps" (ideally I would like to have 150 too, like CFX), but I am not sure about what "Minimum Time Step" and "Maximum Time Step" mean. It seems, I am only allowed to repeat at them what I previously inserted at "Step End Time". So, I would like to know, what is it exactly about. See Figure B attached. What am I doing wrong? Am I not modeling the problem in a proper way? Am I misunderstanding the use of a FSI here? I really appreciate for your help. Thank you in advance. |
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February 20, 2017, 04:13 |
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#2 |
New Member
Join Date: Aug 2013
Posts: 23
Rep Power: 13 |
Why just dont you turn auto time stepping off, type in 1 and use direct coupling?
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February 20, 2017, 05:36 |
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#3 |
New Member
Leo
Join Date: Jul 2014
Posts: 13
Rep Power: 12 |
Hello,
Thank you for your help. Yes, it seems to work. Now about the Question 1 (my biggest problem actually), do you have any idea? I need to import at least 15 (better 150) pressure loads but I all get is 1. (Figure A) Thank you in advance. |
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May 23, 2017, 15:49 |
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#4 |
New Member
Khiew Chee Keong
Join Date: Mar 2017
Location: Malaysia
Posts: 4
Rep Power: 9 |
Hi LeandroGSS, have you solve your question 1? I am facing the same problem right now when I link my fluent solution to transient structural.
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December 13, 2018, 01:16 |
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#5 |
New Member
Siva Teja Golla
Join Date: Dec 2018
Posts: 1
Rep Power: 0 |
Hi LeandroGSS,
Have you solved your first problem... I am facing the same problem too... I am using Fluent + Transient mechanical... If you solved it, please let me know... |
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December 13, 2018, 05:49 |
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#6 |
New Member
Join Date: Aug 2013
Posts: 23
Rep Power: 13 |
Basically the 1way FSI is the main problem. In my case, the the deflection / deformation is to big and thus the 1way FSI fails to model the case correctly. So perhaps just add a System Coupling module and drag your mechanical and fluent setups on this. Its quite straight forward...
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December 18, 2018, 05:17 |
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#7 |
Senior Member
urosgrivc
Join Date: Dec 2015
Location: Slovenija
Posts: 365
Rep Power: 12 |
A CFD post macro vas needed for multiple FSI timestep data transfers in the past, I don't know if something better exists jet.
Map is named: ACT_FSI-Transient_V170.3 and it includes: FSI_Transient_Export_Vol FSI_Transient_Export_Surf CFX_FSI_IORead CFX_FSI_IOWrite and instructions on how to use it it works like a charm i got it from the ansys site and it is free so I can share it. This is the link to my drive: https://drive.google.com/open?id=15K...Ub3a6y0HAvnaA7 I am not sure if it works on newer versions of Ansys as I haven't used it for quite a while but I think it should as it is a macro I was using it for transfer of volume temperatures Last edited by urosgrivc; December 19, 2018 at 01:58. |
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February 8, 2024, 18:55 |
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#8 |
New Member
Parsa
Join Date: Jan 2024
Posts: 2
Rep Power: 0 |
Hello LeandroGSS,
I have same problem as yours in 1-way FSI, specially your 1st question. Have you reached any solutions? I would appreciate it if you could share it. Thanks |
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Tags |
1-way fsi, ansys, cfx, fsi, transient |
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