Introduction to ANSYS Polyflow Application
Modeling Forming Using ANSYS Polyflow
Modeling Forming Problems Using ANSYS Polyflow
• Refinement where/when necessary
• Element subdivision
– 2D, 3D, 3D shell
– subdivides quads in 4 sub-quads
– subdivides bricks into 8 sub-bricks
– hierarchical subdivision
• Adaptive Meshing on Remeshing (mesh quality based)
– used for 2D, 3D cases involving free surface (possible with contact)
– transform all elements to triangular (2D) or tetrahedral (3D)
Time Dependant Flows
• This refers to simulations where time derivatives are present in the basic equations describing the flow problem.
• Time-dependent flows may or may not reach a steady-state solution.
• Any boundary condition parameter may be a function of time.
• Material parameters may also depend on time, although the physical relevance can be questioned.
Results Post Processing CFD Post
Defining Workbench Parameters
• Geometrical (defined in DM or CAD)
– E.g. tube diameter, die land length, size of a parison, location of a parison, plug shape, etc..
• Meshing (ANSYS Meshing)
– Mesh resolution on a certain feature (e.g. for mesh sensitivity)
• Boundary condition (ANSYS Polyflow)
– Flow rate, inlet temperature, heat transfer coefficient, inflation pressure, draw down force, …
• Material properties (ANSYS Polyflow)
– Density, viscosity, specific heat, …
Output Parameters (to be defined in CFD Post)
• Pressure drop, flow uniformity, maximum temperature, …
A solution is possible at a low flow rate
– A solution is not possible at the desired (high) flow rate
– Using solution at low flow rate as an initial guess, solution at higher flow rate is possible
– This approach is called “EVOLUTION” on the flow rate
– Flow rate is evolving form an initial value to the final desired value
– To reach the final desired value of the flow rate, many “evolution” steps may be required, each taking the solution of the previous step as an initial solution
– The EVOLUTION concept can be applied on boundary conditions (flow rate, temperature, draw down force, amount of slip….) and material properties (shear thinning index, relaxation time, specific heat, …)
– ANSYS Polyflow has built-in capabilities to solve highly non-linear problems using EVOLUTION
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