A multiphysical modeling approach [1] has been employed to simulate the selected laser sintering (SLS) process (a kind of L-PBF) for a single layer of particles. A discrete element approach [1] was implemented using CUDA to model particle-to-particle and particle-to-wall mechanical and thermal interactions. The modeling approach can be characterized in two parts: (1) dynamic simulation of the deposition of the powder particles; (2) thermal simulation of the temperature evolution of the particles after a single pass of a laser beam. The implementation detail and numerical experiments are described in the report. A shorter presentation is in the slides. This project won the final project competition.
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Successful on Linux platform with gcc 6.4.0 and nvcc 9.0.
On Linux PC
>> cd dynamics/
>> make -f makefile-pc clean
>> make -f makefile-pc
On Euler (a multi-core supercomputer cluster)
>> cd dynamics/
>> make -f makefile-euler clean
>> make -f makefile-euler
CPU version
>> ./cpu_dynamic
CUDA version
>>> ./gpu_dynamic
Both CPU and GPU version will
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output particle radius to radius.txt
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output particle initial velocity to vxyzs0.txt
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output particle initial position to xyzs0.txt
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output particle final velocity to vxyz.txt
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output particle final position to xyzs.txt
Successful on Linux platform with gcc 6.4.0 and nvcc 9.0.
On Linux PC
>> cd thermal/
>> make -f makefile-pc clean
>> make -f makefile-pc
On Euler (a multi-core supercomputer cluster)
>> cd thermal/
>> make -f makefile-euler clean
>> make -f makefile-euler
CPU version
>> ./cpu_thermal <test_type>
CUDA version
>>> ./gpu_thermal <test_type>
test_type = 1: load xyzs.txt and radius.txt from infiles/
test_type = 2: initialize particle position and radius randomly
CPU version will output temperatures of final time step to outfiles/temperatures.txt
GPU version will output temperatures of final time step to outfiles/temperatures_cuda.txt
When test_type = 2, both CPU and GPU version will also output outfiles/xyzs_after.txt and outfiles/radius_after.txt which are the particle positions and radiuses initialized randomly.
[1] Rishi Ganeriwala and Tarek I Zohdi. A coupled discrete element-finite difference model of selective lasersintering. Granular Matter, 18 (2):21, 2016.