Ansys_12.0_CFX_官方教程
Ansys 12.0 CFX 官方教程 11B

The syntax rules are the same as those for conventional arithmetic. Operators are written as: + (addition) - (subtraction) * (multiplication) / (division) ^ (exponentiation) Variables and expressions are case sensitive (example: t vs. T) Expressions must be dimensionally consistent for addition and subtraction operations (example: 1.0 [mm] + 0.45 [yds] is OK)
Chapter 11 CFX Expression Language (CEL)
Introduction to CFX
ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved.
11-1
April 28, 2009 Inventory #002598
11-5
Depending on your physics, some variables will not be valid – e.g. you need to solver heat transfer to use T
April 28, 2009 Inventory #002598
CFX Expression Language
Example:
ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved.
ANSYS 12.0 下载与安装方法图解

此次安装,使用的是2.55G虚拟光盘文件,电驴下载地址为:ed2安装完毕后,占用硬盘空间超过6G。
系统为Win7旗舰版。
安装所需时间较长,约半小时!1、在安装包中找到MAGNiTUDE文件夹。
2、将该文件夹拷贝到其他位置,比如桌面上。
【注:由于我使用的是虚拟光盘进行安装,存在写入权限的问题,所以才需要将该文件夹拷贝出来。
如果直接使用硬盘文件则无需拷贝】打开文件夹,运行ap120_calc.exe程序。
输入Y,回车,程序自动生成许可证文件。
3、运行安装主程序,点击setup.exe。
4、弹出安装菜单,按照从上至下的顺序,先点击第一个按钮,开始安装VC++ 2005 Redistributable、VC++ 2005 SP1 Redistributable、.NET frameword 2.0 SP1。
5、点击OK。
6、开始自动安装过程。
在Win7下安装时,可能会出现下面的提示:实际上,系统已经很智能地告诉我们解决方法了:只需要进入控制面板,在分类视图下,点击“程序”分类标题,程序和功能\打开或关闭Windows功能,在列表中,勾选.NET Framework3.5项目下的两个复选框,确定即可。
7、安装完成后,点击第二个按钮,开始安装ANSYS主程序。
8、点击“I AGREE”,NEXT,选择程序平台。
9、修改安装路径Install Directory,Mount Directory不需要自己更改,程序会自动检测。
10、选择程序组件,一般默认即可,无需改动。
11、设置Pro/E等CAD软件,如果没有,则无需设置,如下图所示。
12、确认刚才的各项操作。
13、Next,开始安装,需要解压缩100个安装包,所以时间比较长。
14、等待安装完成。
15、点Next,进入设置界面。
自动检测过程完成后,弹出下面的对话框:在Hostname1栏中,填入计算机名。
(注意!计算机名必须为英文,而且不要含有连字符“-”,这可能是导致安装失败的重要原因!)16、程序根据提供的计算机名自动配置。
Ansys_12.0_CFX_官方教程__12

Rotating domain
Single Component (blower wheel blade passage)
Multiple Component (blower wheel + casing)
x
Domain
Mesh Deformation – Domain changes shape as a function of time
ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved.
12-5
April 28, 2009 Inventory #002598
Topics Domain Motion
– Rotating Fluid Domains
Single Frame of Reference Multiple Frames of Reference
– Frame Change Models – Pitch Change
Training Manual
Moving Zones
Rotating Reference Frames Why use a rotating reference frame?
Training Manual
– Flow field which is unsteady when viewed in a stationary frame can become steady when viewed in a rotating frame – Steady-state problems are easier to solve...
Ansys_12.0_CFX_官方教程__10(Heat Transfer)

– Optically thick/dense means that the fluid absorbs and re-emits the radiation
• For optically thick media the P1 model is a good choice
– Many combustion simulations fall into this category since combustion gases tend to absorb radiation – The P1 models gives reasonable accuracy without too much computational effort
1) Rosseland Model (Diffusion Approximation Model) 2) P-1 Model (Gibb’s Model/Spherical Harmonics Model) 3) Discrete Transfer Model (DTM) (Shah Model) 4) Monte Carlo Model (not available in the ANSYS CFD-Flo product)
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights
10-3
April 28, 2009 Inventory #002598
Heat Transfer
Governing Equations
Training Manual
• For multicomponent flows, reacting flows and radiation modeling additional terms are included in the energy equation
win7下ansys12.0_安装说明【自己网上搜集整理的】

windows 7 下 ansys安装很久以前下载了ansys12.0的安装文件刻录了光盘,在xp安装总是不成功,最近安装了windows 7旗舰版,又把ansys12.0的光盘拿出来研究了下,安装成功了!下面分享一下安装的过程,可能每个人惢遇到的问题不一样,这里提供一个交流的地方,大家分享自己的安装问题和解决办法,毕竟ansys12.0和windows7都是比较新的东西,好多东西不够成熟。
1,安装过程首先安装required prerequisites(必须的基础环境),在此过程中会安装MS VC++ 2005、sp1和 Framework 2.0 sp1,前两个安装都没有问题,问题在于windows7中自带的Framework版本是3.5,安装Framework 2.0 sp1时会提示错误,不要管他,待安装完成后,点击开始——控制面板——程序和功能——打开或关闭windows功能——勾选Microsoft. NET Framework3.5.1,点击确定后配置好后(可能需要安装光盘),就可以继续下面的安装过程了。
这里我们采用windows7的Framework3.5.1来代替2.0的,这个是微软的开发基础包,简单点说,进入.net时代,所有基于.net开发的程序都需要有.net Framework支持才能运行,这个基础开发包是向下兼容的。
然后安装ANSYS,安装过程有点长,完成后需要配置许可证,先不用管,需要填入服务器名称的时候,可以先填入本机计算机名(查看方法装过ansys的人都知道)。
这个过程不会有问题(我在xp和windows7下面都没有遇到问题)。
最后安装ansys许可证(License Mansger)管理器,这里我们还记得,在从前版本的安装中,都用到个license.dat(txt)的文件,12.0(VeryCD上的那个32位版本的)在流入网络的时候,其实都是自带了破解程序(自动生成许可证)的,原来以为是官方的什么工具,后来仔细看了光盘里面的unified120_check.txt才发现,这些网上的版本都是自带破解的。
Ansys 12.0 CFX 官方教程

ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All
April 28, 2009 Inventory #002598
Installation and Licensing
CFD Products
Training Manual
Appendix E Licensing
Introduction to CFX
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
E-1
April 28, 2009 Inventory #002598
Installation and Licensing
Installation and Licensing
CFD Products
Training Manual
• You may also have purchased the following modular products:
– Again, each product allows you to run only 1 task at a time
• “ANSYS CFD”
– Run ANSYS Meshing, CFX-Pre, CFX-Solver, CFD-Post or FLUENT
• “ANSYS CFX”
– Run ANSYS Meshing, CFX-Pre, CFX-Solver or CFD-Post
• “ANSYS FLUENT”
– Run ANSYS Meshing, FLUENT or CFD-Post
• “ANSYS CFD-Flo”
– A reduced capability version of CFX
Ansys 12CFX 官方教程 11B

CFX Expression Language (CEL)
Introduction to CFX
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
11-1
April 28, 2009 Inventory #002598
Function sin(x) cos(x) tan(x) *** asin(x) acos(x) atan(x) exp(x) loge(x) log10(x) abs(x) sqrt(x) if(test, res1, res2)* min(x,y) **** max(x,y) **** step(x) * Operand’s Dimensions [x] Angle Angle Angle Dimensionless Dimensionless Dimensionless Dimensionless Dimensionless Dimensionless Any Any Any Any Any Dimensionless Operand’s Values Any Any Any -1 x 1 -1 x 1 Any Any 0<x 0<x Any 0 x Any Any Any Any
– You cannot add values with inconsistent dimensions
• Fractional and decimal powers are allowed (example: a^(1/2) + 1.0^0.5) • Units of expressions are not declared – they are the result of units in the expression (example: a [kg m^-3] * b [m s^-1] has units of [kg m^-2 s^-1] • Some constants are also available in CEL for use in expressions:
Ansys_12.0_CFX_官方教程__15

• These may be important when simulating noise and vibration
Review and Tips
Heat Transfer
Training Manual
• High speed flows (Mach > 0.2) should use the Total Energy model
• The double precision setting for the Solver is recommended for CHT simulations (i.e. when a solid domain is included) • Always make sure energy imbalances have reached acceptable levels in CHT cases • Enable Viscous Work or Viscous Dissipation if heating due to viscous effects is important • If thermal radiation is modeled choose an appropriate model depending on the optical thickness • Thin Wall modeling and thermal contact resistances can be set at domain interfaces
• Boundary conditions are created in each domain when a Domain Interface is created; generally you should not edit these directly • When the mesh is different on each side of the interface a GGI (General Grid Interface) is used
Ansys12.0CFX官方教程9A课件

April 28, 2009 Inventory #002598
Turbulence
Governing Equations
Conservation Equations
Training Manual
Continuity Momentum Energy
t
xi
(ui )
0
t
Turbulence
Chapter 9 Turbulence
Introduction to CFX
ANSYS, Inc. Proprietary
© 2009 ANSYS, Inc. All rights reserved.
9-1
Training Manual
April 28, 2009 Inventory #002598
• In the smallest eddies, turbulent energy is converted to internal energy by viscous dissipation
ANSYS, Inc. Proprietary
© 2009 ANSYS, Inc. All rights reserved.
(ui
)
x j
(uiu j
)
P xi
ij
x j
t
(htot )
x j
(htotu j )
P t
x j
(ui ij
T x j
)
where
ij
பைடு நூலகம்
ui x j
Ansys_12.0_CFX_官方教程__16

ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
A-11
April 28, 2009 Inventory #002598
Scripting and Automation
Why use Perl?
Training Manual
April 28, 2009 Inventory #002598
Scripting and Automation
Line Input Mode
• Open session launched from command line or within a script by specifying „-line‟ flag – e.g. >cfx5post –line • Client includes viewer and a command line input
CCL
Training Manual
User Input Client
• The user interfaces with the “client”, while the “server” processes the data • The most common client is a graphical user interface, but line and batch interfaces also exist
Engine
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
A-7
April 28, 2009 Inventory #002598
Scripting and Automation
Ansys 12.0 CFX 官方教程 15A

• Remember to create the Transient Results object before running
Review and Tips
Heat Transfer
Training Manual
• High speed flows (Mach > 0.2) should use the Total Energy model • The double precision setting for the Solver is recommended for CHT simulations (i.e. when a solid domain is included) • Always make sure energy imbalances have reached acceptable levels in CHT cases • Enable Viscous Work or Viscous Dissipation if heating due to viscous effects is important • If thermal radiation is modeled choose an appropriate model depending on the optical thickness • Thin Wall modeling and thermal contact resistances can be set at domain interfaces
Ansys 12.0 CFX 官方教程 1

Gas Domain of interest Cyclone
Can it be simplified or approximated as a 2D or axisymmetric problem?
L-valve Gas
Cyclone Separator
ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved.
– Remove unnecessary features that would complicate meshing (fillets, bolts…)? – Make use of symmetry or periodicity?
Do you need to split the model so that boundary conditions or domains can be created?
6. Define solver settings
Solve
7. Compute solution
7. Compute and monitor the solution
Post Processing
8. Examine results
ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved.
Problem Identification
1. 2. Define goals Identify domain
Training Manual
How will you isolate a piece of the complete physical system? Where will the computational domain begin and end?
Ansys_12.0_CFX_官方教程__14C

ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
14-5
April 28, 2009 Invcs Overview
Immersed Solids / 6-DOF Rigid Body Solver
• Immersed Solid
– CFX-Solver applies a source of momentum to the fluid inside the immersed solid domain in order to force the flow to move with the solid
Training Manual
• 6 Degrees of Freedom (DOF) Rigid Body Solver
– Used when a solid object interacts with a fluid, but does deform – Solution method is more efficient than a twoway Fluid-Structure interaction problem – Can be combined with Immersed Solids – Applications:
14-1
April 28, 2009 Inventory #002598
Advanced Physics Overview
Multi-Configuration
• Define multiple linked simulations
Training Manual
Ansys_12.0_CFX_官方教程__6

Before You Start CFX Define your modeling goals Identify the computational domain
Training Manual
– Simplify if possible – Think about where boundary conditions can be set – Avoid placing boundaries in potential recirculation areas when possible
– Different reference frames, e.g. rotating, stationary – Different domain types – fluid, solid, porous – Different materials, e.g. oil, copper and water
– Residuals are converged to at least RMS 1e-4 – Imbalance are below 1% – Monitor Points for quantities of interest have reached steady values
ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved.
The Reference Pressure should be set to the operating pressure of the device
ANSYS, Inc. Proprietary 2009 ANSYS, Inc. All rights reserved.
6-4
April 28, 2009 Inventory #002598
ANSYS 12.0 官方培训手册-Introduction to CFX-PART G

WS1-2
April 28, 2009 Inventory #002599
Goals
Workshop Supplement
• This workshop models the heat dissipation from a hot electronics component fitted to a printed circuit board (PCB) via a finned heat sink. The PCB is fitted into a casing, which is open at the top and bottom. • Initially only the heat transfer via convection and conduction will be modelled. The effect of thermal radiation will then be included at a later stage.
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
TOC-4
April 28, 2009 Inventory #002599
Options
Workshop Supplement
1. In the tree expand Case Options, double-click General and ensure that Automatic Default Domains is switched on and Automatic Default Interfaces is active. 2. Set the Interface Method to One Per Domain Pair. Click OK.
- 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。
B-5
April 28, 2009 Inventory #002598
Turbo Pre and Post
CFX-Pre Turbo Mode 2. Component Definition – Import meshes (right-click) – Define rotating or stationary
Turbo Pre and Post
CFD-Post Turbo Workspace
Training Manual
• The Turbo workspace:
– Creates span, m’, axial, radial and theta coordinate frames – Allows users to visualize components in turbo space – One-button calculation of velocity components (such as circumferential, radial, axial, meridional) – Quickly generate turbo related charts and graphs – Provides access to turbo specific macros
Appendix B Turbo Pre and Post
Introduction to CFX
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
B-1
April 28, 2009 Inventory #002598
Turbo Pre
• Stage, Frozen Rotor, Transient Rotor Stator
– Solver parameters
• Advection Scheme • Time Scale/Step controls
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
• Enter General Mode to make further operations
– Ex. Create monitor points – Ex. Setup a multiconfiguration run
Training Manual
• Write .def file and start the solver
B-7
April 28, 2009 Inventory #002598
Turbo Pre and Post
CFX-Pre Turbo Mode 4. Interface Definition – Domain interfaces automatically generated! – Setup/check all Domain Interfaces
•
– –
Advantages:
Rapid setup for turbomachinery simulations Automatic creation of domain interfaces and boundary definitions
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
B-6
April 28, 2009 Inventory #002598
Turbo Pre and Post
CFX-Pre Turbo Mode 3. Physics Definition – Fluid properties – Steady State vs. Transient – Model Data
Training Manual
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
B-9
April 28, 2009 Inventory #002598
Turbo Pre and Post
CFX-Pre Turbo Mode 6. Final Operations – Options:
• Meshes will remain, data will not
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
B-4
April 28, 2009 Inventory #002598
Turbo Pre and Post
All Turbo postprocessing performed on the Turbo tab
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
B-14
April 28, 2009 Inventory #002598
• • • • • Frozen rotor Transient rotor stator Stage Periodic None
Training Manual
– Right-click to add or delete interfaces
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
B-12
April 28, 2009 Inventory #002598
Turbo Post
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
1. 2. 3. 4. 5. 6.
Training Manual
Summary – six steps to setup a turbomachinery simulation:
Basic Settings Component Definition Physics Definition Interface Definition Boundary Definition Final Operation
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
B-2
April 28, 2009 Inventory #002598
Turbo Pre and Post
CFX-Pre Turbo Mode
Training Manual
• Define rotational speed
Training Manual
– Define number of passages – Define tip clearance if applicable – For multiple stages, use right click to:
• Change component order • Automatically align components
• Energy and Turbulence Models
Training Manual
– Boundary Templates:
• Pt inlet - Ps outlet • Pt inlet - mass flow outlet • Mass flow inlet – Ps outlet
– Interface Type:
CFX-Pre Turbo Mode 1. Basic Settings – setup axis of rotation and coordinate frame
Training Manual
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
B-13
April 28, 2009 Inventory #002598
Turbo Pre and Post
CFD-Post Turbo Workspace
Training Manual
• The Turbo workspace improves and speeds up postprocessing for turbo machinery simulations
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
B-3
April 28, 2009 Inventory #002598
Turbo Pre and Post
CFX-Pre Turbo Mode
Training Manual
• At any time, users can enter turbo mode from the file menu – Tools > Turbo Mode • Buttons at bottom to navigate through the wizard: – Next – move to the next page – Back – move to the previous page – Finish – any data that has been entered will be committed, Pre goes into General Mode – Cancel – close Turbo mode and revert to General Mode