Twenty-Third Symposium on Naval Hydrodynamics (2001) / Chapter Skim
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An Experimental and Computational Study of the Effects of Propulsion on the Free-Surface Flow Astern of Model 5415
An Experimental and Computational Study of the Effects of Propulsion on the Free-Surface Flow Astern of Model 5415
Pages 704-712
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From page 704... ...
As pad of We Ova Frce-S~cc lni~advo, computabonsof1bc 6~csnt~cc Cow andsub-sur~ce vetochics Gore obtained on Me bare hull modo1 Bailout ~~ R~NSprodichoncodos,LNCLEsndUnivcrsi~of loams CPDSH1F. in addi~ontothc RANS pr~dic(ons,pote~islOow codesincluding SWAN,LA~P, andU~DELTA,~orgalsouscitopredictthp~cosur~ceOoy ~roundthc modct Th~resu~sof~bLe~ ~Ion, Dig Sons of Tic predictor codas arc Hoj<15415 ~asbuJ1Of~god ~ 1960 ~ ~ anew scale Who of24.824 sndis,cprcsebtad~c ofa mown nave cohabit hug Ann.
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From page 705... ...
glued 1 ~ Isgmp~ic Vow of Modal 5413 Tbc c~pprim~nts described herein arc obt~in~d bow #~ and Befoul ~< propellers operand. To obtain ~~ most Cute #~-sut~cc mousuromcnt6, in Sac exporimepls ~c modal Was mounted in s fixed aim condition co~e~po~dlog ~ ~c avid ~ of Me model ~ ~ Frown aver of picker p.28 (2.00 Basic)
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From page 706... ...
The ~~ cal~:ra6~n permits caT~n of (he probes' the signal cond~g ampl~, ar:d the A/:D conve:~r as ~ system. Figure ~ - Longitudinal Wave Cut Set Up Operating Proced~S Paste zeroes are co11~d ~n cal~ water Are each act.
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From page 707... ...
E~perlme~t~1 Setup To cr~to a topo~~hy of thc ~6e sur~co tbe stom of tbo modct ~u~ prob~s arc mo-ed tot on a b~sokol ~1~ct~ed to a ~i-slido. T\o p~otes o~ ~ ~ ~ ~ ~ ~ ~ cc~prlin~ of th~ mdd~l, ~i~ s i.08 c~ spacipg b~#bon prob~s.
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From page 708... ...
Ata Froudc numberof0.41,the Hansom is completely clearly and the Bow converges iD bighly ~kbul~ntre~ioncovcrin~ ~narc~of0.T5sb~ length longitudinally by 0.05 ship lea 1ransvcrscly. Fi~elOsbo~1b~di~cDcosductopropul(onin ~e~vc ~cIdLebini ~ctr~som et aFroude numbarof0.41.
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From page 709... ...
0,015 nine 0.0 1 C In .
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From page 710... ...
The bias limit is d~tc~i~ed by calibtstions donc insi~ =~ ~ sc~l,~ sppligd across thc entirc ~can ~ave. Tho unce~ain~ is co-~cd by ~c rooG sum~squarc of tho bias ~nd prec1~ion [m~s (~Lo com~ moIdy re~od 10 as th~ systemadc and random c~ors~ Tbe combin~d ~cectai~ ~r ~c propcllcd a~d unpropellad con~ions arc prcsented 1n T~1c 4.
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From page 711... ...
to think Jim Rice and Ian Mut ick for pled suppo t during file collection of these data sets Scott Percival and Steve Fisher helped prepare file figures for this pape' Much appreciation goes to Willi m Bo ton and Peter Congedo documented file hull fomm and the hyd odyn mic flow, photogmphically Finally, l w uld like to Hank Edhv Rood at file Office of Naval Research for his vision which recogni ed the conhibutions Hat CFD predictions could make to hip design and his commitment to obtami g the be t possible experimental data for validation of these prediction codes REFERENCES A AA (199S) , A AA Standard S-071-1005, Assessment of Wi d Tunnel Data Unce tainty ANSI/ASME (199S)
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From page 712... ...
n ve cut experiments Ed the stern topography experiments, be model was f Fed et c sirJcage Ed trim corresponding to the trim She m odel would achieve et c given Froude mmmber he fi ed trim was chosen to be that cssumedby the mmpropelled model he m odel was then fixed et His same h im when the propellers were operctmg Obtaining date around the model et He same trim condition, with Ed without propellers operctmg provided c selfconsistent set of date for CFD validation
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