Fluids

Fluids

How to fix the floating point error?

    • Newton Duarte
      Subscriber
      Good afternoon. So, I am producing a simulation, where the objective is to evaluate the flow of a system composed of two phases where one of them is continuous and the other formed by particles, through a composite geometry by a viewer. Within this evaluation, the percentage of particles that interact with the wall (display) that corresponds to this viewer. Within the setup step, a multiphase model (Eulerian), laminar viscosity, and the discrete phase was selected as granular, simulating the particles of the system. From what was understood based on the tutorial and on the forums with DPM in Ansys Fluent, capable of simulating a flow of particles, there are present in another continuous phase, having thus, a multiphase flow, where the goals set are not linked only to a graphic result, but a result attributed to the calculation, which is desired to be carried out. This is because, our objective is to evaluate the possibility of understanding the interaction of particles with a simulation applied in the simulation, accounting for the geometry of the interaction that can interact with a wall that is specified. However, at the moment in question, a divergence discontinuity occurs in the flow, providing an error during compilation, all output parameters and boundary conditions have already been verified based on the indicated tutorial as well. Attached is a PDF document, follows the steps of the process and comments some errors. So, I would like to count on your kind help to guide me out of the impasse and be able to move forward with the evaluation process.


    • Nikhil Narale
      Ansys Employee

      Hello, it is difficult to comment without knowing details of the setup. Can you please share:

      • Screenshot of the residuals plot. 
      • Mesh screenshots and the mesh quality.
      • Time step size.
      • Solution methods (P-V coupling scheme) selected.

      Looking forward to hearing back from you.

       

      Nikhil

    • Newton Duarte
      Subscriber

       

      Hi, thanks for the reply.

       

      So, i have took the screenshots about the details of the setup.
      Ps: The time step size was was modified in different variations, but the error persisted.

       

      • Solution methods (P-V coupling scheme) selected.

       

      • Time step size and residuals plot:

       

      • Mesh screenshots and the mesh quality:
       
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