cfd analysis of a car
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CFD Analysis of a Car Using Ansys Fluent Module.to find Lift and dragTRANSCRIPT
9/14/2015 CFD analysis of a car using ansys fluent module
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CFD ANALYSIS OF A CAR USING ANSYS FLUENT MODULE
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Saturday, 12 September 2015 00:00
CFD analysis of a car using ansys fluent moduleWritten by Super User (/cfd-tutorials/itemlist/user/942-superuser)
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9/14/2015 CFD analysis of a car using ansys fluent module
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Computational fluid dynamics (CFD) has bring revolutionary changes for last one decade. Asit is playing an important role in different fields like medical, aeronautical, civil to many others.Vehicles outer body shapes have always been area of interest for engineers. Currentlyavailable CFD tools like Ansys Fluent make it possible to perform 2D as well as 3D analysisin order to obtain side contours of design parameters like pressure, velocities and possiblecorrection in vehicle geometries. Ultimate goal of performing CFD analysis of a car to improveits design by reducing air flow resistance and increasing aerodynamic stability.
Problem Description
A car of about 2500 length is moving with speed of 100Km/hr that is equivalent to 27.5m/s.Ambient temperature is about 298K. Perform CFD analysis in order to evaluate pressure andvelocity contours of air flow around car outer body.
Assume standards air properties and 2D geometry as well. Car geometry as well ascomputational domain has been shown in Figure1.
Figure1
Car 2D Geometry
In order to download 2D step file of car geometry click here.(https://www.dropbox.com/s/1d36qbc66812gzv/car.STEP?dl=0)
Prerequisites
9/14/2015 CFD analysis of a car using ansys fluent module
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This tutorial has been written in this context that you basic level understandings of ansysworkbench geographical user interface.
Learning objectives
1. How to import 2D surface model of car surrounding domain in ansys design modeler.2. How to set inflow boundary conditions and moving walls conditions?3. How to add inflation meshing at car edges?4. How to prepare ansys fluent setup?5. How to generate contours as well as flow path lines?
Start Ansys Workbench
Run ansys workbench from start menu and drop down ansys fluent module in to projectschematic window asFigure2.
Figure2
Right click Geometry>properties, a schematic window open, select 2D from analysistype asFigure-3.
9/14/2015 CFD analysis of a car using ansys fluent module
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Figure3
Right click Geometry>Import Geometry>Browse and give path where you have downloadedcar STEP file.
Named SelectionRight click Mesh>Editand wait until ansys mechanical completely opens.Enable edge selection button from geometry toolbar and select all outer edges of cargeometry by holding Ctrl key. NowRight click>Create Named selection and give the nameas "Carwalls" then OK,Figure4
Figure4
Similarly, select bottom and top walls and give the named selection as "wall_outer".
Select front edge and give the Named selection as "inflow" and select the rear edge and givethe named selection as "outlet. All named selection have been shown in figure5.
9/14/2015 CFD analysis of a car using ansys fluent module
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Figure5
Meshing
Go to Menu bar>Units>Metric(mm, Kg, N, S, mV, mA).From Outline left click on mesh and goto Details of mesh then select element size asshown in Figure6.
Figure6
Right click on Mesh>Insert>Inflation and select whole surface and click apply in geometrycell. Select Named selection from Boundary scoping method and select car_walls thenpress Enter key. Now set transition ratio to 0.5 and number of layers to 4. Update mesh now.Inflation layers has been created, Figure7.
9/14/2015 CFD analysis of a car using ansys fluent module
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Figure7
Starting ansys fluentGo to ansys workbench project schematic window and right click Setup>Edit, a FluentLauncher window opens and select parallel from Processing options and enter number ofcores that your system has in Process Box and click OK as in Figure8. Wait until ansysfluent module completely opens.
Figure8
Step1: General settingsFrom solution setup click General>Units and make sure that pressure units are in Pascal,temperature units are in Kelvin and velocity units are in mm.
Step2: Models selectionFrom Modelsdouble click Energyand check energy equation as in Figure9. Double clickViscousLaminar and select kepsilon(2eqn) model.
9/14/2015 CFD analysis of a car using ansys fluent module
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Figure9
From materials select air>Create/Edit button, then a material window opens. Select idealgas from density box then click Change/Create>Close,Figure10.
Figure10
Step4: Boundary conditionsFrom boundary condition zone, select inflow and select velocityinlet from type box. A newwindow opens, enter the velocity value to 17.7m/s and OK, Figure11. Click on Outlet andmake sure Pressureoutlet is selected from Type box.
9/14/2015 CFD analysis of a car using ansys fluent module
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Figure11
Select wallouter and select wall from Type box and click Edit then select moving wall asshown in figure12.
Figure12
Step5 Solution
1. From solution methods, select the Coupled scheme and second order Discretizationtechniques.
2. From Solution Control, enter the Courant Number value to 1 and all under relaxationfactors to 0.7.
3. From Monitors, double click on Residuals and enter absolute convergence criteria values
9/14/2015 CFD analysis of a car using ansys fluent module
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to 0.001 for all parameters.4. From initialization select Standard Initialization from initialization methods andpress Initialize button.
5. From Run Calculation, enter the number of iteration to 5000 and click Calculate button.Ansys fluent starts calculation now. Wait until solution converge for this current cfdanalysis of car. Scaled residual graphs on solution convergence has been shownin figure13.
Figure13
Results: Contours and Plots
In order to see air flow pressure distribution around airfoil go to Results andanimation>Contours>Setup>Filled and select Pressure then Static pressurefrom Contours of box and click Display,Figure14.
9/14/2015 CFD analysis of a car using ansys fluent module
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Figure14
Similarly you can see velocity contours,Figure15.
Figure15
We can draw pathlines in ansys fluent. From results and animations>Pathlines and selectMesh from color by, enter step size 0.08m, number of steps 252 and path skip 25. Thenselect Interiorcar from surfaces selection and click Display, Figure16.
Figure16
Flow pathlines will be appear around car body in this cfd tutorial, Figure17.
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Figure17
Conclusion
In this tutorial we learnt how to carry out cfd analysis of a car using ansys fluent module. Wealso learnt to draw flow pathlines and also created mesh inflation using ansys mechanical.
Last modified on Sunday, 13 September 2015 05:11
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