(Failed) Use of optimisation with FLUENT study

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 December 12, 2017, 04:39 (Failed) Use of optimisation with FLUENT study #1 New Member   Mike Join Date: Nov 2017 Posts: 1 Rep Power: 0 I am trying to design a the underfloor of a car, and have set up a 2D study to find the best inlet and outlet angles of the floor, so essentially a diffuser. I am only looking at the outlet at the moment. Due to constraints, the outlet can only be a certain length. As such I am modelling the length as a function of the angle. My model is imported from SolidWorks, I have the both the angle of the diffuser and length of the diffuser as parameters. I can then mesh and run a simulation. I then use the Lift force or force in the Y direction to calculate the downforce the floor is producing. I set the Y force as my output parameter. In an optimisation study, I then set my diffuser length as a function of my angle so it changes with the angle automatically. Finally for my objectives, I select maximise downforce and put no constraints on the angle - my hope being ANSYS will find the angle that returns most downforce. The optimisation then forms a study with multiple angles and calculates their respective lengths. It then fails when trying to calculate the Y force and returns this error:Update failed for the Optimization component in Direct Optimization. The Optimization component in Direct Optimization does not contain all entity types advertised in its component template, even after updateI cannot understand why it isn't working, and I can't find much information on the subject either. I can run individual studies using geometry I change in Design Modeler. I wouldn't even mind selecting the best points myself, If I could just get it to work so I can have a table showing diffuser angles vs downforce, that would be good. I have got optimisation to work when doing Static Structural analysis on ANSYS, so I wonder if it is something to do with FLUENT? Or maybe because I create a boolean of my floor, so the actual model with all dimensions isn't really in the simulation? I'm at a loss, and would appreciate any help. I am certain there are several problems throughout my study - I am mostly self taught. Many thanks.

 Tags failed, fluent, optimization, parameter, solidworks