NATIONAL DEFENCE UNIVERSITY OF MALAYSIADuty, Honor, Integrity
CFD SIMULATIONOF 81MM MORTAR AMMUNITION USING
ANSYS FLUENT 13.0Presenter :3011394 P Kdt Mohammad Shaffri B. Mat Sabri Supervisor : Prof Dr Megat Hamdan Bin Megat Mohamad Mech. Engineering Dept Faculty of Engineering
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INTR D CTI N
SCOPE OF PRESENTATION
Introduction - Problem statement - Objective of study - Scope of work
Methodology
DiscussionsConclusions & recommendation s
Results
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INTR D CTI N
INTRODUCTIONWhat is Mortar Bomb ? - a weapon which is easy to operate even though it was designed to fire in high trajectory which can be set between 45 and 85 degrees angle to the ground
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PROBLEM STATEMENT1 228 April 2011
previous study from Nazamuddin on Design and Simulation of 81mm Mortar Ammunition developing using PRODAS software determine the projectile range .
no further studies to analyze the Model B using any other simulation software
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INTRODUCTION
OBJECTIVES
1To simulate the flow behaviour of 81mm mortar using ANSYS FLUENT 13.0.
2To i entify the air flow velocity potential location aroun 81mm mortar ammunition.
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INTRODUCTION
SCOPE OF WORKSTo study the mortar ammunition theory
To simulate the aerodynamic flow using ANSYS FLUENT 13.0
To spot location of air flow highest velocity for 2D modelling.
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INTRODUCTION
LITERATURE REVIEWBack r Previ s a alysiscti A alysis f M rtar amm iti A alysis f CFD s ftware
CFDCFD back r
I tr
The ry
C
cl si
Desi & f cti
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LITERATURE REVIEW
Previous Studies Analysis
Mortar Ammunition Analysis
CFD analysis studies
Design and Simulate the 81mm Mortar Ammunition by Nazamuddin28 April 2011
Wind Tunnel Test on Improved Mortar Protectile (IMP) Krishnamoorthy
Potential Location of Air Flow around Car s Body in Generating Electricity by Sharedzal Johit
ME7751 Final Project using NACA 4415 AIRFOIL by Neil Panchal
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METHODOLOGY
DESIGN PROCESS
METHODOLOGY
FLOWCHART
ANALYSIS PROCEDURE
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METHODOLOGY
ANSYS 13.0 Layout
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MECH. ENGINEERING DEPARTMENTFINAL YEAR PROJECT1)Model B needs to be saved as IGS file (iges) 2)Using coordinate system as dimension to drawGenerate Drawing Using GAMBIT 2.2.30 Meshing The Drawing Using ANSYS MESHING Flow Analysis Using ANSYS FLUENT 13.0
METHODOLOGY
Pre-processing part: a) Mesh - 0.05mm for element size - 12631 total elements b) Boundary condition - inlet = 260 m/s - use SUTHERLAND as fluid medium - pressure far field for wall
ANALYSIS PROCEDURES
Solving parts 1) Spalart - Allmaras - suitable for airfoils boundary layer 2) Boundary condition - pressure far field Post-processing 1) monitors = CD and CL 2) set iteration for 1000times11
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METHODOLOGY
PRELIMINARY RESULT
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RESULTS & DISCUSSIONS
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RESULTS & DISCUSSIONS
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RESULTS & DISCUSSIONS
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RESULTS & DISCUSSIONS
VELOCI
CONTOURS
MAXIMUM VELOCITY DEVELOP FROM COLOUR SCALE
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RESULTS & DISCUSSIONSMAXIMUM VELOCITY IN COLOUR CONTOURS
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RESULTS & DISCUSSIONSHIGHER MACH NUMBER DEVELOP FROM CONTOURS
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RESULTS & DISCUSSIONSHIGHER MACH NUMBER IN COLOUR CONTOURS
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RESULTS & DISCUSSIONSHIGHER VELOCITY IS IN FRONT BODY (SPOTTED LOCATION)
VELOCITY VECTORS
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RESULTS & DISCUSSIONS INCREASE THE CAPABILITY FOR THE FIREPOWER FOR THE 81MM MORTAR AMMUNITION
CD & CL VALUES CAN BE MODIFIED WITH THE SPOTTED HIGHEST VELOCITY LOCATION28 April 2011 Mech. Engineering Dept Faculty of Engineering 21
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RESULTS & DISCUSSIONS
MAXIMUM MACH NUMBER
HIGHER MACH NUMBER IN VELOCITY VECTORS
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RESULTS & DISCUSSIONS
HIGHER STATIC PRESSURE IN VELOCITY VECTORS LOWEST STATIC PRESSURE IN VELOCITY VECTORS
HIGHER PRESSURE AFFECT VELOCITY VALUES Mech. Engineering Dept Faculty of Engineering
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RESULTS & DISCUSSIONS
FINAL GRAPHSTHE HIGHEST PRESSURE AT 9.8 PA
LOWEST PRESSURE AT 6.3 PA
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RESULTS & DISCUSSIONS
THE HIGHEST VELOCITY AT 236.5 m/s HIGHEST STATIC PRESSURE AT 7.33 KPa
LOWEST VELOCITY AT 236.27 m/s LOWEST STATIC PRESSURE AT 7.29 KPa
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RESULTS & DISCUSSIONS
ERROR
acceptable because the error is not more than 10%
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RESULTS & DISCUSSIONS
FORCES VALUE
DRAG FORCE ACT ON 81mm MORTAR
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RESULTS & DISCUSSIONS
LIFT FORCE ACT ON 81mm MORTAR28 April 2011 Mech. Engineering Dept Faculty of Engineering 28
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RECOMMENDATIONS
CONCLUSIONSy First objective was achieved with all result about
81mm mortar can be nown by using ANSYS FLUENT 13.0.y the second succeeded objective which is the
potential location with high velocity located around the front body.
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RECOMMENDATIONS
FUTURE RECOMMENDATIONS1. Studies on propellants for mortar bombs li e the characteristic and figure of the propellant. 2. Terminal ballistic analysis.3. Other
materials can be used to replace the materials used to see how it will gives effect to the result.
4. The proposed model to be fabricated and fired in order to confirm that it can perform as simulation results.28 April 2011 Mech. Engineering Dept Faculty of Engineering 30
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REFERENCES
REFERENCES[1]
Mohd Nazamuddin Bin Mohmad Razali, Design And Simulation of 81mm Mortar Ammunition, Universiti Pertahanan Nasional Malaysia & Universiti Teknologi Malaysia, (2010).
[2]
L.V. Krishnamoorthy, A.R.Rye, H.T.French, C. Wachsberger, DSTO Propulsion and Aeroballistics Research in Support of Project IMP (U), Aeronautical and Maritime Research Laboratory (1994).
[3]
Col. Assoc. Prof Dr. Shohaimi Abdullah, Universiti Pertahanan Nasional Malaysia, interview on 1600H 14 Oct 2010.
[4]28 April 2011
D W Leeming, Introduction to Intermediate Ballistics, Cranfield University (1995). Dept Mech. EngineeringEngineering Faculty of 31
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REFERENCES
[5] Mohd Sharedzal Johit, The Potential Location of Air Flow Around Cars Body In Generating Electricity, Kolej Universiti Teknikal Kebangsaan Malaysia, (2006). [6] John David Anderson, Computational Fluid Dynamics: The Basics with Applications, McGraw Hill Publications. (1995) Pg 99-121. [7] Headquarters Department of the Army, Field Manual Tactical Employment of Mortars, (1992). [8] http://www.firstworldwar.com/weaponry/mortars.htm access on 15 Oct 2010.28 April 2011 Mech. Engineering Dept Faculty of Engineering
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REFERENCES
[9]Malaysian Armed Forces, Data Teknik Senjata, (2004 [10]Major Shohaimi Abdullah, Penetration Performance on Segmented Rods-Comparison with Continuous Rods at High Velocity, Royal Military College of Science, (1995). [11] Neil Panchal. (2010). NACA 4415 AIRFOIL. ME7751 Final Project. [12] Jorge Carregal-Ferreira. (2010). Advanced CFD Analysis of Aerodynamics using CFX. AEATechnology GmbH, CFX. [13]28 April 2011
ANSYS Inc. (2009). User manual. ANSYS Inc Property Mech. Engineering Dept Faculty of Engineering 33
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