Introduction to ANSYS Polyflow Application

Modeling Forming Using ANSYS Polyflow

Modeling Forming Problems Using ANSYS Polyflow

Adaptive Meshing

• 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

Input 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, …

Evolution

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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