phasicFlow/benchmarks/rotatingDrum/readme.md

Benchmarks of rotating drum (v-1.0)

Problem definition

The rotatingDrum case was calculated using well-known discrete element commercial software and phasicFlow, and the calculation time and memory usage were tested when the number of particles was 250 k, 500 k, 1 m, 2 m, 4 m and 8 m.

Figure 1. The snapshot of commerical DEM simulation

Figure 2. The snapshot of phasicFlow simulation

The performance tests were conducted on laptop computers and workstation computers respectively. The configuration information of the laptop computers and workstation computers is shown in Table 1.

Table 1. The parameters of laptop and workstation.

computer	CPU	GPU	Operating system
Laptop	Intel i9-13900HX 2.2 GHz	NVIDIA Geforce RTX 4050Ti 6G	Windows 11 24H2
workstation	Intel xeon 4210 2.2 GHz	NVIDIA RTX A4000 16G	Ubuntu 22.04

A total of 6 groups of working condition tests were carried out, with the particle numbers being 250 k, 500 k, 1 m, 2 m, 4 m and 8 m respectively. The particle diameter, drum length and drum diameter under each working condition are shown in Table 2.

Table 2. The parameters setting of different rotating drum.

Case name	Particle diameter	Particle numbers	Rotating drum length	Rotating drum radius
250 k	6 mm	250,000	0.8 m	0.2 m
500 k	5 mm	500,000	0.8 m	0.2 m
1 m	4 mm	1,000,000	0.8 m	0.2 m
2 m	3 mm	2,000,000	1.2 m	0.2 m
4 m	3 mm	4,000,000	1.6 m	0.2 m
8 m	2 mm	8,000,000	1.6 m	0.2 m

Table 3 and Figure 3 show the calculation time of phasicFlow and well-known discrete element commercial software under different working conditions on a laptop. It can be seen from the table that the increase in calculation time is linearly proportional to the increase in the number of particles. The calculation speed of phasicFlow is about 20% faster than that of well-known discrete element commercial software. The calculation speed of using A4000 graphics card is about 30% faster than that of 4050Ti.

Table 3 The calculation time of different software.

Software	250 k	500 k	1 m	2 m	4 m	8 m
phasicFlow-4050Ti	54 min	111 min	216 min	432 min
commerical DEM-4050Ti	68 min	136 min	275 min	570 min
phasicFlow-A4000	38 min	73 min	146 min	293 min	589 min	1188 min

Figure 3 The calculation time of different software.

Table 4 and Figure 4 show the memory usage of phasicFlow and well-known discrete element commercial software on a laptop under different working conditions. It can be seen from the table that phasicFlow uses about 0.7 GB of memory per million particles, while the well-known discrete element commercial software uses about 1.2 GB of memory per million particles.

Table 4 The memory usage of different software.

Software	250 k	500 k	1 m	2 m	4 m	8 m
phasicFlow-4050Ti	252 MB	412 MB	710 MB	1292 MB
commerical DEM-4050Ti	485 MB	897 MB	1525 MB	2724 MB
phasicFlow-A4000	344 MB	480 MB	802 MB	1386 MB	2590 MB	4966 MB

Figure 4 The memory usage of different software.