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SECURITY ClASSlfiCATlON Of !HIS PAGE 



/: 



/ o 



/'/die 



REPORT DOCUMENTATION PAGE 



la REPOAT SCCURITY CLASSIFICATION 



UNCLASSIFIED 



lb. RESTRICTIVE MARKINGS 



la SECURITY CLASSIHCAHON AUIHORItY 



J DISTRI3UT10N/AVAILA8ILITY O' REPORT 



2b DECLASSIFICATION /DOWNGRADING SCHEDULE 



.' Pe«FOfiMiNG 1 -. ANI/ATION REPOK1 NUMUtR(S) 



DTNSRDC/SHD-1233-01 



S MONITORING ORGANISATION REPORT NUMBER(S) 



&^. NAME Of PEP-O^MiNG ORGANI7A1 ION J 6b OFFICE SYMBOL 



David W. Tay'.or Naval Ship (if applicable) 

 Research ami Development Center! Code 1564 



7a NAME OF MONITORING ORGAN'/AHON 



Ex ADDRESS (Cry. Stdte, and SI? Cod?) 



Bethesda, Maryland 200S4 



?b ADDRESS (City. Stiff, and IIP Code) 



Ha NAME Of FUNDING (SPONSORING 



organization "Naval Sea 

 Systems Command 



8b OFFICE SYMSGl (9. PROCUREMENT INSTRUMENT IDENTIFICATION NUMBER 

 (If applicable) 



f)r ADDRESS (City. State, and ZIP Code) 



Washington, DC 20362 



10 SOURCE OF fUiMOii-JG NUMBERS 



ELEMENT NO 



TASK 



NO 



TvTo^K UNIT 

 [ACCESSION Nl 



n HUE (Include Security Claudication) 



Forces and Moments Acting on a Submersible Moving Beneath the Free Surface or Near a Wall 



\2 PERSONAL AUTHOR(S) 



Younr;. S . Hong 



13a TYPE OF REPORT 



Final 



I 13b TiME COVERED 

 FROM 



|14 DATE OF REPORT (Year Month, Day) V S PAGE COUNT 



1937 July \ _ 



•6 SUPPLEMENTARY NOTATION 



tOSATi COQ'iS 



13 SUBJECT TERMS (Continue on reverse it necessary and oent.ty by block number) 



SUBGROUP 



3 A3STRACT (Continue on reverse it necessary and ic'entity by block number) ■ , , , 



*The forces and moments acting on a submersible are computed wnen it is beneath the t.ee si 

 I face or near a wall. The method used in this report is based on potential theory. In th< 

 I computation of forces and moments on the hull, a three-dimensional method is applied. Th< 

 I free surface condition is linearized and the body boundary condition is exact. The body 

 | surface is discretized with surface elements and the singularity of source and sink is dii 

 | tributed on them. The strengths of the unknown sources and sinks are determined through 

 ! the bodv boundary condition. A two-dimensional method is applied to compute forces and 

 | moments of the control surfaces. The boundary conditions are same as those for three- 

 f dimensional case. Computed forces and moments of the control planes are added to those o 

 I the bare hull. To include the interference effect of the hull on the control planes, the 

 1 flow velocity at each control plane is computed with existence of the hull. There are 

 I some discrepancies between computed results and experimental data because of the effect o 

 Sviscositv. Trie overall trends in the computed results are same as those of the experimen 



^0 D S'RiSU'ON ' AVAILAEHLlTY Of ABSTRACT 

 CSjNU ASSif'ED'UNLiMlTED CI SAME AS RPT 



[2\ ABSTRACT SECURITY CLASS'f ICA'.IO* 



DoriC USERS 



! .'.'a NAME Of RESPONSIBLE iNDiViOUi 



i Young 3. Hong 

 DD FORM 1473, ?.« war 



|22b IELSPHONE (include Ar 



I 202-227-1030 



!c O'f'CE S'VBOi 



Code 1564 



S3 APR edition may be useo until euristited 

 All ether cclitioni are obtolete 



SECURITY '< "LASSlFiCAf'ON O' 



UNCLASSIFIED 



