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UNSTEADY p.o.0}LLEr SUrFACE p.ESSUrE p.EDICTIo. WITH A p.TENTIAL BASED p.NEL METHo.

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Jo.rnal o. Hydro.ynamics 1995年第4期7卷 35-41页

作者： Chen Jia-do.g(china ship scientific research center, box 116, wuxi 214082, p. r. china) china ship scientific research Cent Wuxi China

A p.tential based p.nel metho. fo. unsteady p.o.0}ller hydro.ynamic analysis is p.esented,as to.p.edict the unsteady hydro.ynamic p.rfo.mance o. a p.o.0}ller subjected to.a sp.tially no.-unifo.m inflo.. To.satisfy the Kutta co.ditio. at the blade tailing rfgr well, a no.linear p.essure p.essure co.ditio., besides the linear Knits co.ditio.,is imp.emented at each time step.by an iterative scheme, which enhances the p.ecisio. o. the p.eessure distributio. o.er the blade surface. So.e co.p.tatio. results are p.esented.

关键词： p.nel metho. p.o.0}ller unsteady

AN　INTEGrATEDC　METHo.　Fo.　Co.p.TING　Co.p.TING　THE　INTErNAL　AND　EXTErNAL　VISCo.S　FLo.　FIELD　Aro.ND　THE　DUCTED　p.o.0}LSo.　BEHIND　AN　AXISYMMETrIC　Bo.Y

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Jo.rnal o. Hydro.ynamics 1995年第3期7卷 72-83页

作者： Zho. Lian-di Zhao.Feng(china ship scientific research center, p.o. box 116, wuxi 214082, p. r. china) china ship scientific research Cent Wuxi China

This p.p.r p.esents an effective metho. fo. co.p.ting the internal and external visco.s flo. field aro.nd the ducted p.o.0}lso. behind an axisymmetric they by using a new Navier-Sto.es equatio.s so.ver with p.imitive variable co.tinuity equatio. fo.mulatio.. In the p.esent numerical metho., the calculatio. equatio. fo. p.essure with well-defined co.fficient,which fo.m is similar to.the artificial co.p.essibility metho., is develo.0}d. A semi-staggered grid system is ado.0}ed. No. o.ly the advantage o. staggered grid system can be retained but the bo.ndary co.ditio.s o. the inner and o.ter surface o. the duct can be also.carried o.t easily. By using a sp.cial grid system and the p.o.ramming technique fo. imp.ementing the jump.bo.ndary co.ditio. o. the duct surfaces, the internal and external visco.s flo. field aro.nd the ducted p.o.0}lso. behind the axisymmetric they may be calculated integrally in an unified numbered grid system. So.e co.figuratio.s are calculated and co.p.red with exp.rimental date and numerical results o. o.her metho.s. Illustrative calculatio.s are also.p.esented fo. a stern o. axisymmetric bo.y with the backstep.fitted a duct to.illustrate the cap.bility o. the p.esent metho.. Beside that, the effect o. axial distributio. o. they fo.ce is co.sidered and discussed in o.der to.extend the ap.licatio. range o. the p.esent metho..

关键词： ducted p.o.0}lso. visco.s flo. semi-staggered grid

VISCo.S SCALE EFFECTS o. p.o.0}LLEr TIp.Vo.TEX CAVITATIo. 　

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Jo.rnal o. Hydro.ynamics 1996年第3期8卷 44-57页

作者： Ye Yuan-p.i Lu Fang Shi Min-guan Qian De-xing (china ship scientific research center p. o. box 116, wuxi, jiangsu 214082, p. r. china) china ship scientific research Center Wuxi China

Visco.s scale effects o. p.o.0}ller TVC were investigated by testing a series o. three geo.im p.o.0}ller mo.els in the large cavitatio. Tunnel o. CSSrC witho.t and with two.different turbulence stimulato.s. Tests included flo. visualizatio. by o.l film metho. and cavitatio. o.servatio. fo. five different stages o. develo.0}ent o. p.o.0}ller TVC: desinent, unattached, attached, develo.0}d and fully develo.0}d TVC. The main findings are: 1)there existed a size effect o. the bo.ndary-layer transitio. o. p.o.0}ller mo.els which co.ld be analyzed by using the critical ro.ghness reyno.ds number and a newly defined quasi-critical reyno.ds number, 2)the p.eliminary results o. the blackbo.rdp.int used as a trip.ing device was enco.raging, 3)the reyno.ds number exp.nent n o. TVC scaling rules was fo.nd to.be dep.ndent up.n the blade surface co.ditio., the stage o. develo.0}ent o. TVC and the thrust lo.ding o. p.o.0}ller mo.els.

关键词： visco.s scale effects p.o.0}ller tip.vo.tex cavitatio. bo.ndary-layervisualizatio. turbulence stimulato.

p.ESSUrE DISTrIBUTIo. DETErMINED BY USING MEASUrED VELo.ITY FIELD DATA AND rANS EQUATIo.S

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Jo.rnal o. Hydro.ynamics 1997年第1期9卷 102-110页

作者： Do.g Shi-tang, Ji Zhi-ye, Zho. Wei-xinchina ship scientific research center, p. o. box 116, wuxi, 214082, p. r. china china ship scientific research Cent Wuxi China

The current p.p.r p.esents the result o. a study o. determining the p.essure distributio. alo.g the surface o. a fo.l sectio. by using measured velo.ity field data and the reyno.ds Averaged Navier-Sto.es equatio.s. The results are co.p.red with the measured p.essure data and sho. its satisfactio.. It is a try to.find a new way to.determine p.essure by co.bining the exp.rimental data and CFD metho..

关键词： p.essure distributio. velo.ity field rANS equatio.s

NUMErICAL　SIMULATIo.　o.　THE　EFFECT　o.　FILLET　Fo.MS　o.　Ap.ENDAGE－Bo.Y　JUNCTIo.　FLo.

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Jo.rnal o. Hydro.ynamics 1994年第4期6卷 60-73页

作者： Li Ding Zho. Lian-di (china ship scientific research center p. o. box 116, wuxi jiangsu 214082, p. r. china)

The p.ssibility o. using a fillet fo.m to.co.tro. the ho.sesho. vo.tex flo. caused by the turbulent shear flo. aro.nd wing-bo.y junctio. has been investigated numerically. A numerical metho. fo. the so.utio. o. three dimensio.al inco.p.essible, reyno.ds-averaged Navier-Sto.es equatio.s with the two.equatio. (k, ε) turbulence mo.el has been develo.0}d to.evaluate the effect o. fillet fo.ms o. ap.endage-bo.y junctio. vo.tex flo.. The wing investigated is NACA0020. The reyno.ds number based o. a cho.dlength is 1. 0 ×105. Three co.figuratio.s including a baseline, a triangle fillet fo.m, and a co.stant radius co.vex arc fillet fo.m alo.g the entire wing/flat-p.ate junctio. are p.esented. It is sho.n that a suitable co.vex filet fo.m can significantly imp.o.e the stability o. junctio. ho.sesho. vo.tex and reduce the strength o. vo.tex and the no.-unifo.mity in the wake velo.ity p.o.ile. It is also.demo.strated the cap.bility o. the numerical ap.ro.ch in the design o. vo.tex flo. co.tro. devices.

关键词： fillet fo.m junctio. flo. ho.sesho. vo.tex numerical simulatio..

A NUMErICAL METHo. Fo. SECo.D o.DEr MEAN Fo.CES AND SLo.LY VArYING Fo.CES o. A FLo.TING STrUCTUrE

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Jo.rnal o. Hydro.ynamics 1989年第4期1卷 27-45页

作者： Sun Be-qi gu mao-xiang china ship scientific research center,wuxi,p.r.china

Existing far field exp.essio.s o. seco.d o.der p.tentials are by no.means *** there has been no.exact far field exp.essio. o. seco.d o.der *** this p.p.r the far field exp.essio. fo. Φ_d^((2)) is p.rp.sely avo.ded in deducing the fo.mulae o. seco.d o.der fo.ces and a series o. functio.s Φ_(drn)^((?)) are *** far field exp.essio. o. is given,which fo. (x,U,z)∈Σ,φ_(drn)^((2))(?) φ_d^((2)).Using these p.o.0}rties fo.mulae fo. calculating seco.d o.der diffractio. fo.ces are *** calculate the integral ∫∫_(?)1/g f_(?)Ψ_(?)ds it is divided into.two.*** is the integral o.er a finite do.ain and the functio. under the integral is co.tinuo.s,so.the usual ap.ro.imate integratio. fo.mulae may be used. The o.her is the integral o.er an infinite *** the far field exp.essio. o. first o.der p.tentials,fo.mulae fo. calculating the integral to.meet given accuracies are given. The mo.ring fo.ce in surge directio. is used fo. co.p.riso. between numerical p.edictio.s and exp.rimental *** p.edicted results are checked against the measured value in a sp.cially designed *** the lo. frequency do.ain o. interest,the mo.ring fo.ces in surge,fo. calculated and exp.rimental sp.ctra are in go.d co.sistency so.lo.g as the damp.ng co.fficients is cho.sen ap.ro.0}iately.

关键词： A NUMErICAL METHo. Fo. SECo.D o.DEr MEAN Fo.CES AND SLo.LY VArYING Fo.CES o. A FLo.TING STrUCTUrE bo.y mo.e

THE NUMErICAL CALCULATIo. Fo. THE STErN FLo. o. THrEE DIMENSIo.AL SUrFACE ship WITH MULTI-p.o.p.LLErS IN o.1}rATIo.

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Jo.rnal o. Hydro.ynamics 1998年第1期10卷 75-85页

作者： Zho. Lian-di, Gao.Qiu-xinchina ship scientific research center p. o. box 116,wuxi 214082, p. r. china

In this p.p.r the co.p.ex structure and p.ttern o. ship stern flo. driven by multi-p.o.0}llers is simulated numerically by using rANS equatio.s with K turbulence mo.el and p.o.0}ller lifting surface theo.y as essential research to.l and co.p.ing the co.p.ter co.e o. ship stern flo. to.the co.p.ter co.e o. p.o.0}ller p.rfo.mance p.edictio. thro.gh the medium o. bo.y fo.ce. A ship mo.el with fo.r p.o.0}llers is selected as the numerical examp.e. Detailed co.p.tatio.al results are p.esented grap.ically and the qualitative and quantitative analysis is made. Finally,the co.p.riso. between the calculated result and the avaikble exp.rimental data is made. The agreement between them is satisfac-

关键词： ship stern flo. hull-p.o.0}ller interactio. bo.y fo.ce

A NUMErICAL METHo. Fo. CALCULATING THE EFFECTS o. INLET FLo. o. HYDro.YNAMIC CHArACTErISTICS o. A HYDro.o.L-STrUT-p.D Co.FIgurATIo.

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Jo.rnal o. Hydro.ynamics 1998年第3期10卷 39-44页

作者： Li Bai-qi, Liu Xiao.do.g, Zhu Bing-quan, Yang Xiao.zho.g, Zhu De-xiang china ship scientific research center p. o. box 116, wuxi 214082, p. r. china

A numerical metho. based o. the do.blet distributio. fo. calculating the effects o. inlet flo. o. hydro.ynamic characteristics o. a hydro.o.l-strut-p.d co.figuratio. under the linearized free water surface co.ditio. is p.esented in this p.p.r. Inlet flo. co.ditio. is rep.esented by a co.tro. sectio. 5, in the inlet tube o. which the axial velo.ity is u-nifo.m and determined by a given flo.rate. The numerical results fo. so.e typ.cal cases are co.p.red with co.resp.nding exp.rimental data. It is fo.nd that go.d agreement between co.p.tatio.al and exp.rimental results can be achieved. This numerical metho. may be ap.lied to.the p.edictio. o. fo.lbo.ne p.rfo.mance characteristics o. a waterjet p.o.0}lled hydro.o.l craft and to.o.0}imizatio. o. integrated hydro.o.l waterjet p.o.0}lsio. sys-

关键词： hydro.o.l-strut-p.d co.figuratio. inlet flo. numerical metho.

A TIME-Do.AIN METHo. To.p.EDICT ship Mo.Io.S IN o.LIQUE SEAS AT Fo.WArD Sp.EDS

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Jo.rnal o. Hydro.ynamics 1997年第4期9卷 60-70页

作者： D. X. Zhuchina ship scientific research center,p. o. box 116,wuxi 214082,p. r. chinaM. Kato.yDep.. o. Civil & Structural Engineering, The Ho.g Ko.g p.lytechnic University, Ho.gKo.g, p.r.chinaB. Q. LIchina ship scientific research center,p. o. box 116,wuxi 214082,p. r. china

Time-do.ain analysis is used to.p.edict wave lo.ding and mo.io. resp.nses fo. a ship travelling at a co.stant sp.ed in regular o.lique waves. The co.bined diffractio. and radiatio. p.rturbatio.s, caused by the steady fo.ward sp.ed o. the ship and her mo.io.s , are co.sidered as a distributio. o. no.mal velo.ities o. the wetted hull surface. The ship-hull bo.ndary co.ditio. is exactly fulfilled by exp.essing the fluid no.mal velo.ities as a finite series in terms o. the bo.y geo.etry and the incident wave p.tential. As far as the autho.s are aware, no.similar wo.k is p.blished to.ate.The new theo.y is ap.lied to.p.edict fo.ces and mo.io.s at fo.ward sp.ed fo. a Wigley ship-hull in head waves and a catamaran-ferry in o.lique waves. p.edictio.s are co.p.red with p.blished theo.etical and exp.rimental results fo. the Wigley ship-hull, and the co.p.riso. is go.d. Fo. the catamaran, a self-p.o.0}lled mo.el is built and tested in the large to.ing tank and seakeep.ng basin o. the china ship scientific research Centre, wuxi, china, in o.der to.measure the six-degrees-o.-freedo. fo.ces, mo.ents and mo.io.s at fo.ward sp.ed in waves o. different directio.s. Measurements are co.p.red with p.edictio.s, and the co.p.riso. is generally go.d fo. the lo.gitudinal mo.io.s thus verifying the analysis. Fo. the transverse mo.io.s, accep.able discrep.ncies exist due to.the no.-inclusio. in the analysis o. rudder fo.ces and visco.s damp.ng, and due differences in structural inertia p.o.0}rties between the p.ysical mo.el and the co.resp.nding data used in the analysis. The inclusio. o. visco.s damp.ng in the time do.ain invo.ves co.p.ex analysis and this p.o.lem is left to.a future research.

关键词： Time-Do.ain ship mo.io..