add viscous solid model and corresponding case #1003

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Job	Run time
macOS-build	6m 36s
Windows-build	21m 53s
Linux-build	12m 29s
Linux-float	1h 52m 5s
macOS-test	3h 15m 35s
Linux-test	3h 26m 44s
Windows-test	4h 57m 12s
	14h 12m 34s