Streamline Prediction and Particle Tracing

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Contents

Introduction

HyperXtrude

Figure below shows the simulated flow streamlines for the case of flat die and conical die extrusion.

Streamlines for flat die and conical die simulation

Conical

As per the figure below, particle traces were launched from a fixed X,Y,Z location on dummyblock face in the model for three different positions –TOP, MIDDLE and AXIS –at three different time steps. Time Step 01, Time step 14 and Time step 28 each respectively correspond to beginning, half-way and end of the extrusion cycle. All the primary and derived quantities in the simulation are printed by the code along with the global X,Y,Z position of the particle.

PNG Particle Trace locations.png
Understanding the positions
AXIS Center fiber
MIDDLE Quarter fiber
TOP Near-to-Surface fiber


The figure below shows the strain rate evolution for TOP, MIDDLE and AXIS particle at various time steps. The abscissa represents the resultant forward (+Z) distance traveled by the launched particle. It is seen that for each tracing particle the strain rate does not evolve after time step 14. Signalling some kind of steady state is reached.

JPEG Particle Trace STRAIN AXIS.jpg
JPEG Particle Trace STRAIN MIDDLE.jpg
JPEG Particle Trace STRAIN TOP.jpg
Strain rate evolution

The following figure shows the evolution of strain and Z-velocity for all the particle traces for all time steps on a single plot. Notice that there is almost no strain and nearly zero velocity at time step 1 implying that these quantities have not evolved. Therefore, for texture prediction the data at time step 1 is not sufficient to desire an accurate output.

JPEG Particle Trace Strain All time steps.jpg
JPEG Particle Trace Velocity All time steps.jpg
Strain and Z-velocity evolution

Flat die

ABAQUS

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