ADsk: correction to disk average velocity equations #3644

Job	Run time
build-drivers-release	5m 5s
build-all-debug	7m 5s
build-postlib-release	12m 13s
build-all-debug-single	2m 46s
build-test-uadriver-debug	1m 15s
rtest-module-drivers	4m 38s
rtest-modules-debug	11m 7s
build-fastfarm-release	12m 39s
build-openfast-release	5m 42s
build-interfaces-release	4m 30s
rtest-interfaces	3m 27s
rtest-OF-simulink	11m 51s
rtest-OF-5MW_Land_AeroMap	1m 32s
rtest-OF-5MW_Land_BD_DLL_WTurb	2m 12s
rtest-OF-5MW_OC3Trpd_DLL_WSt_WavesReg	5m 7s
rtest-OF-5MW_OC3Mnpl_DLL_WTurb_WavesIrr	2m 24s
rtest-OF-5MW_OC4Jckt_DLL_WTurb_WavesIrr_MGrowth	2m 27s
rtest-OF-5MW_OC4Semi_WSt_WavesWN	1m 44s
rtest-OF	15m 46s
rtest-OF-linearization	4m 29s
rtest-FF	3m 8s
	2h 1m 7s

Provide feedback