LOADS AND RESULTS ON CFD PROPELER ANALYSIS LOADS AND RESULTS ON CFD PROPELER ANALYSIS Șef lucr. dr. ing. Adrian POPA, Șef lucr. dr. ing. Ionuț Cristia

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1 LOADS AND RESULTS ON CFD PROPELER ANALYSIS Șef lucr. dr. ing. Adrian POPA, Șef lucr. dr. ing. Ionuț Cristian SCURTU Academia Navală Mircea cel Bătrân, Constanța, România REZUMAT. Pentru a putea determina încărcările și forța de împingere generate de elicea navală la turații cuprinse intre 100 si 400 rpm se va utiliza softul Ansys. Componenta CFX utilizată va genera rapoartele caracteristice de viteză, presiune și turbulență pentru domeniul fluid studiat. Orice model de elice se poate verifica in o astfel de analiză in etapa de proiectare pentru intelegerea fenomenelor asociate elicilor precum cavitatie si randamente mecanice. Cuvinte cheie: elice, Analiza CFD, Analiză navală, soft comercial Ansys.. ABSTRACT. The Ansys software will be used to determine the loads and thrust generated by the propeller at speeds between 100 and 400 rpm. The CFX component used will generate the characteristic velocity, pressure and turbulence ratios for the studied fluid field. Any propeller model can be verified in such an analysis at the design stage to understand the phenomena associated with propellers such as cavitation and mechanical efficiency. Keywords: propeller, CFD analysis, naval analysis, commercial software Ansys. 1. PROBLEM DESCRIPTION AND INTRODUCTION 1. Ansys Workbench modeling is presented below. between 100 and 400 rpm. The CFX component used will generate the characteristic velocity, pressure and turbulence ratios for the studied fluid field. Any propeller model can be verified in such an analysis at the design stage to understand the phenomena associated with propellers such as cavitation and mechanical efficiency in tables presented below. Table 1. File Information for CFX Case CFX File Date 05 septembrie 2017 Fig.1.. Ansys Workbench File Time File 06:54:44 p.m. CFX5 File Version Mesh Report Table 2. Mesh Information for CFX Domain Nodes Elements Fig.2.. Propeler 3D model The Ansys software will be used to determine the loads and thrust generated by the propeller at speeds Domeniu rotatie AllDomains Buletinul AGIR nr. 4/2017 octombrie-decembrie 31

2 3. Physics Report CERCETARE ȘI EXPERTIZĂ INGINEREASCĂ LA CONSTANȚA Table 3. DomainPhysics for CFX Domain - Domeniu rotatie B74 Definition Material Library Morphology Continuous Rotating Alternate Rotation Model Off Angular Velocity e+02 [rev min^-1] Axis Definition Coordinate Axis Rotation Axis Coord 0.2 ReferencePressure Heat Transfer Model Isothermal Temperature e+01 [C] Model SST Turbulent Wall Functions Automatic Domain - B155 Definition Material Library Morphology Continuous Stationary ReferencePressure Heat Transfer Model Isothermal Temperature e+01 [C] Model SST Turbulent Wall Functions Automatic DomainInterface - Default Interface Boundary List1 Default Interface Side 1 1 Boundary List2 Default Interface Side 1 Interface InterfaceModels General Connection FrameChange Frozen Rotor MeshConnection GGI Fig. 3. Eddy contour on propeller Fig. 4. Propeler presure contour 1 Fig. 5. Propeller pressure contour 2 Fig. 6. Velocity in 3D domain Fig. 7. Streamlines in 3D domain 32 Buletinul AGIR nr. 4/2017 octombrie-decembrie

3 Domain Domeniu rotatie Table 4. BoundaryPhysics for CFX Boundaries Boundary - Default Interface Side 1 1 F75.74, F76.74, F77.74 Boundary - Elice Wall Roughness Boundary - Intrare F100.74, F101.74, F102.74, F105.74, F106.74, F78.74, F80.74, F81.74, F83.74, F85.74, F86.74, F88.74, F89.74, F91.74, F92.74, F93.74, F94.74, F95.74, F97.74, F98.74, F99.74 No Slip Wall Smooth Wall INLET F Normal Speed Normal Speed e+00 [m s^-1] Medium IntensityandEddyViscosityRatio Boundary - Default Interface Side 1 F , F , F Boundary - Iesire OUTLET F PressureProfileBlend e-02 Relative Pressure PressureAveraging Boundary - Lateral Average Static Pressure Average Over WholeOutlet F Free Slip Wall Fig. 8. Pressure in 3D domain. 4. Solution Report Table 5. BoundaryFlows for CFX Flow Default Interface Side 1 1 ( Domeniu rotatie ) Default Interface Side 1 ( ) Momentum X Y Z Boundary e e e e+00 Boundary e e e e+00 Elice ( Domeniu rotatie ) Boundary e e e e+00 Iesire ( ) Boundary e e e e+00 Intrare ( ) Boundary e e e e-05 Lateral ( ) Boundary e e e e+02 Buletinul AGIR nr. 4/2017 octombrie-decembrie 33

4 CERCETARE ȘI EXPERTIZĂ INGINEREASCĂ LA CONSTANȚA Table 6. Forces and Torques for CFX X Y Z Default Interface Side 1 Default Interface Side 1 1 Elice Lateral Total Force e e e+00 Pressure Torque e e e+00 Viscous Torque e e e+00 Total Force e e e+00 PressureTorque e e e+00 ViscousTorque e e e+00 Pressure Force e e e+00 Viscous Force e e e-02 Total Force e e e+00 PressureTorque e e e+01 ViscousTorque e e e-02 Total Torque e e e+01 Pressure Force e e e+02 Viscous Force e e e-03 Total Force e e e+02 PressureTorque e e e+02 ViscousTorque e e e-03 Total Torque e e e Mesh Report Table 2. Mesh Information for rpm Domain Nodes Elements Domeniu rotatie AllDomains Physics Report Fig. 9. pressure in 3D domain. 1. File Report Table 1. File Information for rpm Case rpm File CFX5 File Version 17.1 Table 3. DomainPhysics for rpm Domain - Domeniu rotatie B74 Definition Material Library Morphology Continuous 34 Buletinul AGIR nr. 4/2017 octombrie-decembrie

5 Alternate Rotation Model Angular Velocity Axis Definition Rotating Off e+02 [rev min^-1] Coordinate Axis Rotation Axis Coord 0.2 ReferencePressure Heat Transfer Model Temperature Model Turbulent Wall Functions Domain - Definition Morphology ReferencePressure Heat Transfer Model Temperature Model Turbulent Wall Functions Isothermal e+01 [C] SST Automatic B155 Material Library Continuous Stationary Isothermal e+01 [C] SST Automatic DomainInterface - Default Interface Boundary List1 Default Interface Side 1 1 Boundary List2 Default Interface Side 1 Interface InterfaceModels FrameChange MeshConnection General Connection Frozen Rotor GGI FIg. 10. Pressure contour on 3D domain. Domain Boundaries Domeni u rotatie Fig. 11. Eddy contour on 3D domain. Fig. 12. Presenting two 3D domains. Table 4. BoundaryPhysics for rpm Boundary - Default Interface Side 1 1 F75.74, F76.74, F77.74 Boundary - Elice No Slip Wall Wall Roughness Boundary - Intrare F100.74, F101.74, F102.74, F105.74, F106.74, F78.74, F80.74, F81.74, F83.74, F85.74, F86.74, F88.74, F89.74, F91.74, F92.74, F93.74, F94.74, F95.74, F97.74, F98.74, F99.74 Smooth Wall INLET F Normal Speed Normal Speed e+00 [m s^-1] Medium IntensityandEddyViscosityRa tio Buletinul AGIR nr. 4/2017 octombrie-decembrie 35

6 CERCETARE ȘI EXPERTIZĂ INGINEREASCĂ LA CONSTANȚA Boundary - Default Interface Side 1 F , F , F Boundary - Iesire OUTLET F Average Static Pressure PressureProfileBle nd Relative Pressure PressureAveraging Boundary - Lateral e-02 Average Over WholeOutlet F Free Slip Wall 4. Solution Report Table 5. BoundaryFlows for rpm Flow Momentum X Y Z Default Interface Side 1 1 ( Domeniu rotatie ) Boundary e e e e+00 Default Interface Side 1 ( ) Boundary e e e e+00 Elice ( Domeniu rotatie ) Boundary e e e e+01 Iesire ( ) Boundary e e e e+02 Intrare ( ) Boundary e e e e-05 Lateral ( ) Boundary e e e e+02 Table 6. Forces and Torques for rpm X Y Z Default Total Force e e e+00 Interface Side 1 PressureTorque e e e+00 Default Interface Side 1 1 Elice Lateral ViscousTorque e e e+00 Total Force e e e+00 PressureTorque e e e+00 ViscousTorque e e e+00 Pressure Force e e e+01 Viscous Force e e e-01 Total Force e e e+01 PressureTorque e e e+01 ViscousTorque e e e-02 Total Torque e e e+01 Pressure Force e e e+02 Viscous Force e e e-03 Total Force e e e Buletinul AGIR nr. 4/2017 octombrie-decembrie

7 ratios for the studied fluid field. Any propeller model can be verified in such an analysis at the design stage to understand the phenomena associated with propellers. REFERENCES Fig. 13. The propeler fine mesh domain. 2. CONCLUSION The Ansys software presented the loads and thrust generated by the propeller at speeds between 100 and 400 rpm. The CFX component was used to generate the characteristic velocity, pressure and turbulence [1] [2] Domnisoru L, Găvan E, POPOVICI O Analiza structurilor navale prin metoda elementului finit, Editura Didactica si Pedagogica, Bucuresti 2005, ISBN [3] [4] Călimănescu I., Stan L. C., Computer fluid dynamics (CFD)study of a micro annular gear pump, Atom 2016, Conference Paper. [5] Stan L. Călimănescu I.,. C.A New innovative turbocharger concept numerically tested and optimised with cfd, 2016, Conference Paper. [6] Peter Jamieson, Innovation in Wind Turbine Design. Wiley & Sons 2011, ISBN : Despre autori Șef lucr. dr. ing. Adrian POPA Academia Navală Mircea cel Bătrân, Constanța Absolvent al Academiei Navale Mircea cel Bătrân, locțiitor al comandantului (prorector) pentru formarea continua în cadrul : Academiei Navale Mircea cel Bătrân și cadru didactic asociat. Domenii de competență: Analiza software Ansys, Analiză software structuri mecanice, dinamica structurilor plutitoare. Șef lucr. dr. ing. Ionuț Cristian SCURTU Academia Navală Mircea cel Bătrân, Constanța Absolvent al Academiei Navale Mircea cel Bătrân, promoția 2010, doctor inginer din anul În prezent, șeful Biroului Tehnico-administrativ cercetare științifica al : Academiei Navale Mircea cel Bătrân și cadru didactic asociat. Domenii de competență: Analiza CFD software Ansys, Analiză software structuri mecanice, dinamica structurilor plutitoare, construcția navelor. Buletinul AGIR nr. 4/2017 octombrie-decembrie 37