“Mircea cel Batran” Naval Academy Scientific Bulletin, Volume XX – 2017 – Issue 2 Published by “Mircea cel Batran” Naval Academy Press, Romania // The journal is indexed in: PROQUEST /

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124 DOI: 10.21279/1454-864X-17-I2-023 © 2017. This work is licensed under the Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

CFD RESULTS ON PROPELLER ANALYSIS

Adrian POPA, Academia Navală Mircea cel Bătrân Constanța România Ionuț Cristian SCURTU, Academia Navală Mircea cel Bătrân Constanța România Abstract: The Ansys software will be used to determine the pressures and velocity generated by the propeller with 5 blades in lateral currents. The CFX component used will generate the characteristic velocity, pressure and turbulence ratios for the studied fluid field with a very precise mesh analysis. All data presented from simulation results can be used for shaft dimensioning and further analysis. Keywords: propeller, CFD, analysis, software Ansys Introduction Ansys Workbench work process for CFD simulation is presented below with operations included:

Problem description and introduction Ansys Workbench modeling is presented in Geomery design Modeler for a 5 bladed propeller used in lateral CFD flow tests. We will use a 5 blades propeller importd as STL file in Ansys.

Fig.1. Boolean geometry in DesignModeler

Fig.2. STP generated geometry for CFD test Mesh generation is the practice in Software Ansys of generating a polygonal or polyhedral mesh that approximates a geometric fluid domain. The term "grid generation" is often used interchangeably. Typical uses are for rendering to a computer screen or for physical simulation such as finite element analysis or computational fluid dynamics and for simple problem solving..

“Mircea cel Batran” Naval Academy Scientific Bulletin, Volume XX – 2017 – Issue 2 Published by “Mircea cel Batran” Naval Academy Press, Romania // The journal is indexed in: PROQUEST /

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125 DOI: 10.21279/1454-864X-17-I2-023 © 2017. This work is licensed under the Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

Fig.3. Mesh generation in Mesh Component for

CFX

Fig.4. Piramidal mesh generation in Mesh

Component for CFX

Fig.5. Preparing for CFD simulation

Fig.6. Vertical piramidal mesh generation in Mesh

Component for CFX

Fig.7. Mesh test for quality

“Mircea cel Batran” Naval Academy Scientific Bulletin, Volume XX – 2017 – Issue 2 Published by “Mircea cel Batran” Naval Academy Press, Romania // The journal is indexed in: PROQUEST /

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126 DOI: 10.21279/1454-864X-17-I2-023 © 2017. This work is licensed under the Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

Global Mesh controls for optimal mesh in CFD

Fig.8. Simulation Process in Ansys Software

Fig.9. Cfx pre Settings for CFD test

Table 1. File Information for CFX

Case CFX

File Path

C:\Users\Jhon\AppData\Local\Temp\WB_XON-

PC_7448_2\unsaved_project_files\dp0\CFX\CFX\Fluid Flow CFX_001.res

File Time 12:43:34 AM

File Type CFX5

File Version

14.5

. Mesh Report

Table 2. Mesh Information for CFX

Domain Nodes Elements

Default Domain 239622 1370393

3. Physics Report

Table 3. Domain Physics for CFX

Domain - Default Domain

“Mircea cel Batran” Naval Academy Scientific Bulletin, Volume XX – 2017 – Issue 2 Published by “Mircea cel Batran” Naval Academy Press, Romania // The journal is indexed in: PROQUEST /

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127 DOI: 10.21279/1454-864X-17-I2-023 © 2017. This work is licensed under the Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

Type Fluid

Location B114

Materials

Air at 25 C

Fluid Definition Material Library

Morphology Continuous Fluid

Settings

Buoyancy Model Non Buoyant

Domain Motion Stationary

Reference Pressure 1.0000e+00 [atm]

Heat Transfer Model Isothermal

Fluid Temperature 2.5000e+01 [C]

Turbulence Model k epsilon

Turbulent Wall Functions Scalable

Table 4. Boundary Physics for CFX

Domain Boundaries

Default Domain

Boundary - Boundary 1

Type INLET

Location inlet

Settings

Flow Regime Subsonic

Mass And Momentum Normal Speed

Normal Speed 1.0000e+00 [m s^-1]

Turbulence Low Intensity and Eddy Viscosity Ratio

Boundary - Boundary 2

Type OUTLET

Location outlet

Settings

Flow Regime Subsonic

Mass And Momentum

Average Static Pressure

Pressure Profile Blend

5.0000e-02

Relative Pressure 0.0000e+00 [Pa]

Pressure Averaging

Average Over Whole Outlet

Boundary - Default Domain Default

Type WALL

Location

F115.114, F116.114, F118.114, F120.114, F121.114, F122.114, F123.114, F124.114, F125.114, F126.114,

“Mircea cel Batran” Naval Academy Scientific Bulletin, Volume XX – 2017 – Issue 2 Published by “Mircea cel Batran” Naval Academy Press, Romania // The journal is indexed in: PROQUEST /

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F127.114, F129.114, F131.114, F132.114, F133.114, F134.114, F135.114, F136.114, F137.114, F138.114, F139.114, F140.114, F141.114, F142.114, F143.114, F144.114, F145.114, F147.114, F148.114, F149.114, F150.114, F151.114, F153.114, F154.114, F156.114, F157.114,

Settings

Mass And Momentum No Slip Wall

Wall Roughness Smooth Wall

Fast Calculation for 10e-3 residuals in CFD test Table 5. Boundary Flows for CFX – v1

Location Type Mass

Flow Momentum

X Y Z

Boundary 1

Boundary

1.8159e+02

2.5462e-07

-1.8439e+02

9.3550e-07

Boundary 2

Boundary

-1.8159e+02

-1.1888e-01

1.8187e+02

4.6000e-03

Defau Boun 0.0000 1.218 2.5480 -

lt Domain Default

dary e+00 9e-01 e+00 1.6388e-03

Fig.10. Velocity u contour on a 5 bladed propeller

Fig.11. Velocity v contour on a 5 bladed propeller

Fig.12. Pressure contour on a 5 bladed propeller

“Mircea cel Batran” Naval Academy Scientific Bulletin, Volume XX – 2017 – Issue 2 Published by “Mircea cel Batran” Naval Academy Press, Romania // The journal is indexed in: PROQUEST /

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129 DOI: 10.21279/1454-864X-17-I2-023 © 2017. This work is licensed under the Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

Table 6. Boundary Flows for CFX –v2

Location Type Mass

Flow Momentum

X Y Z

Boundary 1

Boundary

1.8159e+02

2.7462e-07

-1.8838e+02

9.2560e-07

Boundary 2

Boundary

-1.6159e+02

-1.1688e-01

1.8187e+02

4.6000e-03

Default Domain Default

Boundary

0.0000e+00

1.1189e-01

2.1480e+00

-1.6388e-03

Fig.13. Pressure contour on a 5 bladed propeller

Fig.14 Velocity contour on a 5 bladed propeller

Table 7. Forces and Torques for CFX-v1

Location Type X Y Z

Default Fluid FluidInterface Side 1

Pressure Force

0.0000e+00

0.0000e+00

0.0000e+00

Viscous Force

0.0000e+00

0.0000e+00

0.0000e+00

Total Force

0.0000e+00

0.0000e+00

0.0000e+00

Pressure Torque

0.0000e+00

0.0000e+00

0.0000e+00

Viscous Torque

0.0000e+00

0.0000e+00

0.0000e+00

Total Torque

0.0000e+00

0.0000e+00

0.0000e+00

Default Fluid FluidInterface Side 1 1

Pressure Force

0.0000e+00

0.0000e+00

0.0000e+00

Viscous Force

0.0000e+00

0.0000e+00

0.0000e+00

Total Force

0.0000e+00

0.0000e+00

0.0000e+00

PressureTorque

0.0000e+00

0.0000e+00

0.0000e+00

ViscousTorque

0.0000e+00

0.0000e+00

0.0000e+00

Total Torque

0.0000e+00

0.0000e+00

0.0000e+00

Propeller

Pressure Force

-6.9048e+01

-6.3854e+02

-6.4703e+00

Viscous Force

3.6559e-02

2.8645e+00

2.6887e-02

Total Force

-6.9011e+01

-6.3567e+02

-6.4434e+00

PressureTorque

-3.2999e+01

1.0016e+02

1.8079e+01

ViscousTorque

-1.1762e-02

1.8317e+00

-2.1533e-02

Total Torque

-3.2016e+01

1.1199e+02

1.8056e+01

Lateral Pressure Force

-1.7228e+02

1.4969e+00

1.1239e+02

“Mircea cel Batran” Naval Academy Scientific Bulletin, Volume XX – 2017 – Issue 2 Published by “Mircea cel Batran” Naval Academy Press, Romania // The journal is indexed in: PROQUEST /

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130 DOI: 10.21279/1454-864X-17-I2-023 © 2017. This work is licensed under the Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

Viscous Force

-4.4316e-04

3.3752e-03

1.1807e-03

Total Force

-1.3228e+02

1.5006e+00

1.9439e+02

PressureTorque

-5.3516e+00

1.2585e+01

1.0824e+02

ViscousTorque

2.2189e-03

9.2709e-05

1.8172e-03

Total Torque

-5.8486e+00

1.1585e+01

1.0825e+02

Fig.15. Eddy viscosity on CFD test

Fig.16. Velocity v contour on a 5 bladed propeller

Table 8. Forces and Torques for CFX v2

Location Type X Y Z

Default Fluid FluidInterface Side 1

Pressure Force

0.0000e+00

0.0000e+00

0.0000e+00

Viscous Force

0.0000e+00

0.0000e+00

0.0000e+00

Total Force

0.0000e+00

0.0000e+00

0.0000e+00

Pressure Torque

0.0000e+00

0.0000e+00

0.0000e+00

Viscous Torque

0.0000e+00

0.0000e+00

0.0000e+00

Total Torque

0.0000e+00

0.0000e+00

0.0000e+00

Default Fluid FluidInterface Side 1 1

Pressure Force

0.0000e+00

0.0000e+00

0.0000e+00

Viscous Force

0.0000e+00

0.0000e+00

0.0000e+00

Total Force

0.0000e+00

0.0000e+00

0.0000e+00

PressureTorque

0.0000e+00

0.0000e+00

0.0000e+00

ViscousTorque

0.0000e+00

0.0000e+00

0.0000e+00

Total Torque

0.0000e+00

0.0000e+00

0.0000e+00

Propeller

Pressure Force

-6.9048e+01

-6.3854e+02

-6.4703e+00

Viscous Force

3.6559e-02

2.8645e+00

2.6887e-02

Total Force

-6.9011e+01

-6.3567e+02

-6.4434e+00

PressureTorque

-3.2999e+01

1.0016e+02

1.8079e+01

ViscousTorque

-1.1762e-02

1.8317e+00

-2.1533e-02

Total Torque

-3.2016e+01

1.1199e+02

1.8056e+01

Lateral Pressure Force

-1.7228e+02

1.4969e+00

1.1239e+02

“Mircea cel Batran” Naval Academy Scientific Bulletin, Volume XX – 2017 – Issue 2 Published by “Mircea cel Batran” Naval Academy Press, Romania // The journal is indexed in: PROQUEST /

DOAJ / DRJI / JOURNAL INDEX / I2OR / SCIENCE LIBRARY INDEX / Google Scholar / Crossref / Academic Keys / ROAD Open Access / OAJI / Academic Resources / Scientific Indexing Services / SCIPIO / JIFACTOR

131 DOI: 10.21279/1454-864X-17-I2-023 © 2017. This work is licensed under the Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

Viscous Force

-4.4316e-04

3.3752e-03

1.1807e-03

Total Force

-1.3228e+02

1.5006e+00

1.9439e+02

PressureTorque

-5.3516e+00

1.2585e+01

1.0824e+02

ViscousTorque

2.2189e-03

9.2709e-05

1.8172e-03

Total Torque

-5.8486e+00

1.1585e+01

1.0825e+02

Fig.17. Velocity u contour on a 5 bladed propeller

5. CONCLUSION The Ansys software presented all data results from physical data to related calculations related to geometry, mesh and mesh quality in order to give a large vision on lateral simulation on a propeller. The CFX component was used to 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. Velocities presented in contours are one of the most useful results in calculating various propeller related issues.

Bibliography [1] www.ansys.com [2] Domnisoru L, Găvan E, POPOVICI O – Analiza structurilor navale prin metoda elementului finit, Editura Didactica si Pedagogica, Bucuresti 2005, ISBN 973 – 30 – 1075 – 8 [3] Călimănescu I., Stan L. C., Computer fluid dynamics (CFD)study of a micro annular gear pump, Atom 2016, Conference Paper. [4] Stan L. Călimănescu I.,. C.A New innovative turbocharger concept numerically tested and optimised with CFD, 2016, Conference Paper. [5]http://web.mit.edu/xeviroca/www/rocaMeshForSim.pdf [6]https://www.padtinc.com/blog/wp-content/uploads/2017/04/Advanced-Techniques-in-ANSYS-Meshing_Blog.pdf [7]https://www.ozeninc.com/wp-content/uploads/2014/11/MESHING_WORKSHOP_2014.pdf