Unfortunately, I don't think you'll be able to directly simulate this. All I can think of (realistically) is looking at the contact pressure between the o-ring and the valve and making sure that it is higher than the fluid pressure.
You could estimate the size of the area that the fluid pressure is acting over (per the results you've posted) and use that to divide up the o-ring's geometry such that you can apply a pressure load over the new sub-region. This pressure load's pseudo time function will need to be defined such that it comes into play after the o-ring has been compressed. Of course, this won't capture that additional area of the o-ring that will be exposed to the fluid pressure (which will then result in more o-ring deflection).
To account for this, you could do one of two things:
- Measure the new area exposed, modify the size of the sub-region, re-run the study, and repeat as needed.
- Incorperate an robust factor of safety on the amount of contact pressure you need.
Of these two ways, item #2 is the most realistic (#1 would be very time consuming, but I think it's technically possible).
There is software that can do fluid/solid interaction but it's expensive.
Shaun is right in his answer. Unless this seal, is going in the next space shuttle, I'd go with option #2.
All the best,
Nick LuysterOnline SolidWorks Simulation Training
fluid structure interaction if this is critical to the design
something that would help with suggesting an approach to the application
the only other suggestion i have over this would be to do a series of stops and starts on the sim and adjusting the pressure to accuont for the area "seeing" the pressure
Thank you very much to all for the pieces of advice.
I will proceed as Shaun has suggested, it's more practical and realistic.
If you've got access to ANSYS Structural, I believe that this was added in one of the recent releases. Having said that, I would still be inclined to go with Shaun's plan of increasing the contact pressure to account for this and other effects.