ANSYS Fluent Ur Guide 3D CFD Solutions
Application to a 3D NACA 0012 Aerofoil
Dr Nick Lawson – National Flying Laboratory Centre
4/23/2014
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Version 1.5
‘It’s the mesh’ – Prof. Ian Poll, Cranfield, 2012
芹菜饺子馅的做法Contents
1. Introduction (3)
2. Fluent Prerequisites (4)
3. Graphical Ur Interface (6)
4. Start-up (8)
5. Loading Initial Mesh (9)
6. Problem Set-up (10)
6.1 Mesh Scaling (10)
6.2 Mesh Quality Check (10)
6.3 Solver Choice (11)
6.4 Reference Values (11)
6.5 Turbulence Model - Principles (12)
最丑的女人6.6 Turbulence Model - Selection (15)
6.7 Material Selection (18)
6.8 Cell Zone Conditions (19)
6.9 Operating Pressure (20)
6.10 Boundary Conditions (21)
7. Solution (25)
7.1 Setting Solution Methods (25)
7.2 Solution Controls (26)
7.3 Monitors (27)巴西世界杯阵容
7.4 Solution Initialisation (31)
7.5 Run Calculation (32)
7.6 Write Fluent Ca File (33)
8. Job Submission to Astral or the Grid (34)
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9. Solution Verification and Validation (37)
9.1 Solution Verification (37)
9.2 Solution Validation (38)
10. Post Processing (43)
10.1 Data Extraction – Forces and Moments (43)
10.2 Data Extraction – Body Surfaces (44)
10.3 Data Extraction – Fluid Rake Profiles (47)
10.4 Data Transformation (49)
Appendices
Appendix I – ICEM CFD Prism Example Set-up 50 Appendix II – Example of residual output file for monitoring convergence 51 Appendix III – Grid Submission File 52 Appendix IV – Astral Submission File 53 Appendix V – Fluent Journal File 54 Appendix VI – Generating Fluent Journal Files 57 Appen
dix VII – Additional Reference Material 62 Appendix VIII – Aerofoil Validation Data 63 Appendix IX – Drag Rake Calculations 65 Appendix XI – Simulating a Wind Tunnel Working Section 67
1.Introduction
Ansys Fluent is an industry standard CFD solver package which is fully integrated into other Ansys products including Ansys ICEM CFD and Ansys CFD-Post. The three pieces of software, through a Windows or Linux graphics ur interface (GUI) allow the meshing (ICEM), solving (Fluent) and post processing (CFD-Post) of complex CFD problems. With relatively limited training the ur can mesh, solve and prent results and analysis of complex aerodynamic flows. Although the meshing is a key part of the CFD process in ICEM, tting up and understanding the basic limitations of the Fluent solver is also critical to obtain realistic CFD solutions. This is particularly the ca with viscid solutions and the associated turbulence model that is chon. Both Reynolds Averaged Navier Stokes (RANS), Detached Eddy Simulation (DES) and Large Eddy Simulation (LES) solutions can be obtained from Fluent. Only RANS solutions will be considered in this guide.
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The following is a guide intended to show the student the process of obtaining 3D Fluent viscid solutions and the best approach to verify and validate the solutions. Unlike ICEM CFD, Fluent initi
ally appears simple to t up. Obtaining stable and realistic solutions, however, is more complex and for most 3D aerodynamic problems, the size of the mesh requires u of either the Cranfield Grid or Astral supercomputers. Standard deskto p PC’s or Laptops are not powerful enough for running solutions. Therefore this guide also outlines this part of the solution process as well as the solver t-up and solution verification and validation. It focuss more on the ‘how’ than the ‘what’, although references to basic CFD theory are ud when discussing the solution t-up for more complex areas such as the turbulence model.
The example chon for this guide is a NACA 0012 aerofoil with an aspect ratio (AR) of 5, a blunt trailing edge (TE) and a wing chord of 1m. This example was also ud in the ICEM 3D CFD meshing guide and the author assumes the student has already read this previous guide and is competent at basic 3D meshing in ICEM.
Fluent v14.0 is the current version ud.
2.Fluent Prerequisites
File Transfer and Storage
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The requirement to u the ‘Grid’ or ‘Astral’ supercomputers will mean the Fluent ur will need to t up file access either directly by using a Linux logon with computer room PC’s or with Windows through using file transfer software such as ‘Windows SCP’. Windows SCP can also be t up for off-site working as well as on-site. The Windows SCP GUI is illustrated below. Details on how t this software up on your laptop or PC is best f ound by reading the guide ‘Copying data between HPC systems and Windows using WinSCP’ as found on the Cranfield Intranet.
It is also recommended that the student purcha a portable hard drive of at least 1TB capacity as b
oth the Grid and Astral have space and time limits on files placed in the ur’s working directory. After a period of time, the ur’s files are automatically deleted and therefore the student should transfer the files to their own portable drive. A 1TB capacity drive is the minimum as the Fluent ca and data files can typically be in excess of a 1GB each.什么样的校园
The student may need to apply for an Astral account as this is a more powerful supercomputer which is ud by staff and rearchers and therefore it’s access is restricted. Therefor e there must be genuine reasons for access to Astral and the student’s supervisor may need to help with an application for an Astral account. This application can be made to the IT department.
If using a Linux PC in the computer rooms, file access is strai ghtforward using the Linux GUI’s, although the restriction in this ca is the ur cannot now work off-site or from halls of residence.
Putty and Shells
Further access into the supercomputer also requires a UNIX style Shell window. The Shell allows command line inputs to manage files and the submission of jobs into the Astral or Grid queuing system. If using a PC with Linux, a Shell can be directly opened from the front Desktop. For windows,
