ADsk: correction to disk average velocity equations #3695

Job	Run time
build-all-debug	6m 30s
build-postlib-release	11m 16s
build-all-debug-single	3m 25s
build-drivers-release	4m 58s
build-test-uadriver-debug	1m 55s
rtest-module-drivers	4m 56s
rtest-modules-debug	10m 53s
build-fastfarm-release	12m 52s
build-openfast-release	4m 54s
build-interfaces-release	4m 53s
rtest-interfaces	3m 18s
rtest-OF-5MW_Land_AeroMap	1m 33s
rtest-OF	15m 18s
rtest-OF-5MW_Land_BD_DLL_WTurb	2m 11s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	1m 52s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	4m 54s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	2m 10s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 25s
rtest-OF-linearization	4m 42s
rtest-OF-simulink	11m 38s
rtest-FF	2m 26s
	1h 57m 59s

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