[oj.bulmer]

Hi

I was wondering if anyone here has any experience of modelling flow induced vibrations and the corresponding FSI in filtration equipments in the pipelines. Few of the contributing factors that I see can be:

1) Flow pulsation due to compressor in the vicinity in the pipeline
2) Vortex shedding at strainer pores (perforated sheets)
3) Acoustic characteristics due to incoming flow and the inherent design of the equipment
4) Transient phenomena because of the intricate cavities/recirculation etc in the equipment.

While incorporating the relevant contributing factors from the ones listed above will be difficult enough as it is, the situation will be more convoluted when there are porous interfaces/regions in the equipment.

Thanks
OJ

[oj.bulmer]

On the same topic, I have found an interesting paper:

Y Khulief, M. A. Habib, S. A. M. Said, R Ben-Mansour, H. M. Badr, M Anis, and A.E. Khalifa, Vortex shedding-free strainers, Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, Volume 226, Number 2, 2012, Pages 91-104.

But I wonder if anyone has any experience of similar simulations. I was wondering, if all these 4 cases are isolated and if the results are obtained separately to find the peaking frequency in each case would give me anything...

Also, given that strainer will be represented as a porous zone/interface, it will practically smear off the perturbations. In this case, would it be reasonable to trust the transient instabilities obtained by FSI on a full model, with contributions from #1, #3 and #4 taken into account?

Any thoughts around this will give me something...

Thanks!
OJ

[ghorrocks]

I agree with you - I cannot see how modelling the strainer as a porous region can predict the vibration frequencies accurately (your effect #2). You probably can model the other effects you mention but #2 sounds difficult without a detailed model of the strainer.