Simulating a Rubber Pump

- May 2, 2020 at 10:49 pm
  
  firsthero
  Subscriber
  
  so i just wanna simulate this rubber pump when its compressed/stretched
- May 3, 2020 at 12:33 am
  
  peteroznewman
  Subscriber
  
  What question do you have that you want the simulation to answer?
- May 3, 2020 at 1:11 am
  
  firsthero
  Subscriber
  
  how much compression is needed to achieve the desired flow rate and pressure
- May 3, 2020 at 1:45 am
  
  peteroznewman
  Subscriber
  
  Are you pumping air or water?
  
  How do the valves work? Do you have details inside that you can show in a section view?
- May 3, 2020 at 1:55 am
  
  firsthero
  Subscriber
  
  air, and the pump is empty, and they're just normal valves for now
- May 3, 2020 at 11:10 am
  
  peteroznewman
  Subscriber
  
  Define "normal" valves. Simulation requires a painful amount of detail.
  
  What are the performance characteristics of the valve? For example, the pressure vs flow rate curve when they are open?
  
  Or if you don't have that, then you model the physical shape of the tiny parts in the valve and let the solution solve for the flow through the valve.
  
  Also, why are there two tubes on each end? Explain which tube does what and which way the valves are allowing flow.
- May 3, 2020 at 1:21 pm
  
  firsthero
  Subscriber
  
  ok they're check valves, 2 tubes let in air and the other 2 let air out
- May 3, 2020 at 3:00 pm
  
  peteroznewman
  Subscriber
  
  firsthero,
  
  I looked at your other posts since you joined the Community 4 weeks ago. I see that you had a good plan to start in 2D with a CFD model. I didn't see if you were successful at that attempt. A rubber pump with check valves is a very complex model because it requires a two-way Fluid-Structure Interaction (FSI). I think this is way beyond your current level of ability and understanding. I recommend you enroll in the free, online course linked to at the top of this page. There you will get exposure to structural models, 2D CFD models and 3D CFD models. Once you have completed that course, you can reconsider this model.
  
  Note that a two-way FSI model is not available in the Student license, so for that reason, I am done with this discussion.
  
  Good luck.
- May 3, 2020 at 3:08 pm
  
  firsthero
  Subscriber
  
  I was able to resolve my 2d problem.
  
  And i just want to simulate the pump itself, forget the check valves for now
- May 3, 2020 at 3:11 pm
  
  peteroznewman
  Subscriber
  
  Okay, now do a 3D model that does not involve any moving structural parts. Then go on to have some rigid body moving.
  
  With regard to 2-way FSI, what kind of license are you using?
- May 3, 2020 at 3:14 pm
  
  firsthero
  Subscriber
  
  ansys student 2020
- May 3, 2020 at 3:19 pm
  
  peteroznewman
  Subscriber
  
  That means you will not be able to solve a rubber pump with that license. You would need a Research license. That may be available at your University. Ask a Professor about that.
- May 3, 2020 at 3:41 pm
  
  firsthero
  Subscriber
  
  i got a friend who has ansys 19.2 i can use his computer
- May 3, 2020 at 9:00 pm
  
  peteroznewman
  Subscriber
  
  Decide on a 3D flow problem with no moving parts and get a steady state solution.
  
  Once you have that done, learn how to transfer the pressure to a Static Structural model for a 1-way FSI.
  
  The above steps are covered in the free, online course linked to at the top of this page.
  
  Next do a 3D Transient flow problem with no moving parts. Post questions in the Fluid Dynamics section.
  
  Then transfer the pressure to a Transient Structural model for a 1-way FSI.
  
  Finally you can attempt a 2-way FSI. There is a lot to learn. Good luck.
- May 3, 2020 at 9:11 pm
  
  firsthero
  Subscriber
  
  thank you,
  
  you've been of great help