Fluids

Fluids

How to test Roll decay in Fluent?

    • Sellera
      Subscriber

      Hello, I'm trying to observate the roll motion of a hull(2D case). I've tried to simulate using a setup(without 6DOF-I accept tutorials for it) but I'cant found a way to plot the degree x time grafic for the decay.

      Any tips for the case general or to help me with the problem above is welcome 😃.

    • Rob
      Ansys Employee
      You'll need a surface facet (post processing points don't move with the mesh) and monitor the x, y & z coordinates on that facet with time. Assuming that point is directly below the centre of rotation (I'd pick a facet on the keel) you can use Excel and trigonometry to figure out the roll angle. You could use an Expression, but if you retain the raw data you can also use it to calculate the pitch (lengthways motion) too.
    • Sellera
      Subscriber
      I see, I noticed that is possible monitore the coordinates but for that it's necessary to use a Dinamic Mesh, and set up it for the hull right?(I can't plot using the actual configuration because it's not especified the point I want to monitore, right?)
      I've tried but its necessary to use a doc.txt for that setup, how can I prepare that doc?

      Thanks for your answer
    • Rob
      Ansys Employee
      If you want the ship to roll you need the 6DOF solver on a rigid body. What doc.txt? We use .c files to define things, but rigid body may not need that: check the manual (click on Help) and review the examples and tutorials.
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