Example: Automotive Application

For automotive applications, a target time step set to a value of 10 times the reference (nodal based constant) time step is a reasonable value to start with. However, greater than 20 times higher than the reference time step have been successfully utilized.

Table 1. Summary of Full Vehicle Tests Tried with AMS
Load Case	Vehicle Program	Radioss Version	Number of Cores	Model Zize	Original Nodal Time Step	Target Time Step	Speed-up v. Original Nodal Time Step	Comments
Front crash	Neon public	10.0.2		1M	1 $μ$ s	10 $μ$ s	4 x
	Taurus public FFB	11.0.201		0.8 M	0.5 $μ$ s	5 $μ$ s	2.83 x	Rigid wall replaced by rigid mesh and contact interface
	OEM1 FFB	11.	24 x 1	1.3 M	0.5 $μ$ s	5 $μ$ s	3 x	Figure 1
	OEM2 ODB	11.0.230	32 x 1	2 M	0.5 $μ$ s	5 $μ$ s	1.5 x	Figure 2
	OEM2 ODB	11.0.230	6 x 6	2 M	0.5 $μ$ s	5 $μ$ s	2 x
	OEM4 FFB	11.0	32 x 1	1.5 M	0.5 $μ$ s	4 $μ$ s	1.9 x
	OEM4 FFB	11.0.230	8 x 6	6 M	0.5 $μ$ s	5 $μ$ s	1.3 x	Rigid wall replaced by rigid mesh and contact interface
Rear crash	OEM1	11.0_sp	16 x 1	1.1 M	0.1 $μ$ s	2 $μ$ s	5.8 x	Figure 3
Rear crash	OEM1	11.0	16 x 1	1.1 M	0.1 $μ$ s	2 $μ$ s	6.5 x	Figure 3
Side impact	OEM4	11.0	32 x 1	1 M	0.5 $μ$ s	10 $μ$ s	2.1 x	Figure 4
Roof Crush	OEM4	11.0	16 x 1	1.2 M	0.5 $μ$ s	10 $μ$ s	2.9 x	Figure 5
	OEM4	11.0	32 x 1	1 M	0.5 $μ$ s	10 $μ$ s	3.4 x
	Taurus public	11.0	16 x 1	0.8 M	0.5 $μ$ s	10 $μ$ s	4.6 x	Figure 6

All speedup's compare original nodal time step double precision with AMS in single precision.

Automotive Related Results

Table 2. Summary of Full Vehicle Tests tried with AMS in Version 13.0
Load Case	Vehicle Program	Radioss Version	Number of Cores	Model Size	Original Nodal Time Step	Target Time Step	Speed-up v. Original Nodal Time Step	Comments	ODB Offset Deformable Barrier FFB Full Frontal
Front crash	Neon public	10.0.2		1M	1 ms	10 ms	4		Neon public
	Taurus public FFB	13.0	3 x 6 x 2	0.8 M	0.5 ms /dt/inter/del 0.4 ms	5 ms tol 0.001 /dt/inter/del 0.4 ms	1.87	Rigid wall replaced by rigid mesh and contact interface
	OEM1 FFB	11.	24 x 1	1.3 M	0.5 ms	5 ms	3
	OEM2 ODB	11.0.230	32 x 1	2 M	0.5 ms	5 ms	1.5
	OEM2 ODB	13.0	3 x 6 x 2	2 M	0.5 ms /dt/inter/del 0.1 ms	5 ms tol 0.001 /dt/inter/del 0.1 ms	1.51
	OEM4 FFB	13.0	3 x 6 x 2	1.5 M	0.5 ms /dt/inter/del 0.001 ms	4 ms tol 0.001 /dt/inter/del 0.001 ms	0.96
	OEM4 FFB	11.0.230	3 x 6 x 2	6 M	0.5 ms /dt/inter/del 0.1 ms	5 ms /dt/inter/del 0.1 ms	1.3	Rigid wall replaced by rigid mesh and contact interface
Rear crash	OEM1	13.0	3 x 6 x 2	1.1 M	0.1 ms /dt/inter/del 0.04 ms /dt/brick/cst 2.0 ms	2 ms tol 0.001 /dt/inter/del 0.04 ms /dt/brick/cst 2.0 ms	4.03
Side impact	OEM4	13.0	3 x 6 x 2	1 M	0.5 ms	10 ms tol 0.001	2.11
Roof Crush	OEM4 meshed	13.0	3 x 6 x 2	1.2 M	0.5 ms	10 ms tol 0.001	2.83	Rigid wall replaced by rigid mesh and contact interface
	OEM4 meshed	13.0	3 x 6 x 2	1 M	0.5 ms	10 ms tol 0.001	1.13	Rigid wall replaced by rigid mesh and contact interface
	Taurus public meshed rigid ram	13.0	3 x 6 x 2	0.8 M	0.5 ms	10 ms tol 0.001	3.80	Rigid wall replaced by rigid mesh and contact interface
	Taurus public rigid wall ram	13.0	3 x 6 x 2	0.8 M	0.5 ms	10 ms tol 0.001	2.18	Rigid wall parallelepiped

All speedup's compare original nodal time step with AMS both in double precision. The greyed rows relate to models that were not rerun in 13.0 and speedups belong to Table 2.