Finally I had time to catch up on this thread! Impressive work @sjoshi! Looking forward to the next iteration of the simulation results - it looks like you’re getting there. My 2 cents on the simulation:
- Agreed with @Maciek, that the computational domain needs to be deeper to avoid interaction of the flow field with it (I like the expression “ridiculously big domains” ). However I doubt that this is the main reason behind the incorrect results.
- @BenLewis: I think @sjoshi is using a local time-stepping method so numerically it’s possible that transient patterns appear towards the end, looking never really like a “steady state”. However I agree that the question is if what we see is physically correct - the drag and lift plots do look questionable. @gholami mentioned that a good way of assessing the quality of such simulation results is running the same simulation with different time-step length to make sure the results are independent of the time discretization. Probably too early right now but once the results look more trust-worthy
- What about the mesh around the hull itself? On the image it looks quite coarse. Do the result fields close to the hull look mesh-independent? Could be worth looking into this and adding some refinement layers there.
- @quequen: Thanks for linking to the Delft Series. Great data! This is definitely something we will look closer at!
As mentioned in the beginning of this thread I have little background in boat hull design. Therefore I am also very interested in learning more about the general approach to these design projects in terms of simulation. @quequen: You asked if the boat can move freely in this simulation. This method is in the product backlog and will be integrated moving forward. But how important is this kind of analysis within the design phase? Comparing it to other design processes and applying the old “Crouch, Walk, Run” principle, I would assume that this is rather something I do at the very end of a project as it’s quite computationally intensive and rely on faster steady-state, fixed-boat analysis for the main part. Would you agree or are the assumptions behind this analysis type too vast?