Particle movement -3 studies combination

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I have combined 3 studies (one frequency domain and 2 time dependent studies) to investigate particle movement and trapping in a rectangular water channel. However, when I combine the 3 studies and using the feature "inlet-outlet" in the particle tracing for fluid flow module, I do not get any results in the respective plot. However, replacing the "inlet-outlet" with the "Release" feature does give me some results.

Anyone knows why does this happen?

Thank you.


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