Ansys计算温度场操作流程

Instruction of Ansys temperature field calculation

Question 1: Consider an infinite (in one direction) plate with initial temperature T0. One end of the plate is exposed to the environment of which the temperature is T e (III type boundary condition). Analyze the temperature distribution in the plate during the period of 2000s.

问题1：考虑一个方向无限长的平板，初始温度为T0，一段暴露在温度为T e的环境中，分析其在2000s内温度分布情况。

Basic parameters基本物性参数

Geometry几何：a=1 m, b=0.1 m

Material材料：λ=54 W/m·o C, ρ=7800 kg/m3, c p=465 J/kg·o C

Loads载荷：T0=0 o C, T e=1000 o C, h=50 W/m2·o C

Jobname and directory settings设置文件名、存储路径

Menu | File | Change Jobname

Menu | File | Change Directory

Preprocessing前处理

(1) Define Element Type定义单元类型

Preprocessor | Element Type | Add/Edit/Delete

Add: Thermal Mass | Solid | Quad 4node 55

(2) Set Material Properties设置材料属性

Preprocessor | Material Props | Material Models

Thermal: Conductivity: Isotropic KXX=54

Thermal: Density=7800

Thermal: Specific Heat=465

Modeling建模

(1) Create Node 1建立节点1

Preprocessor | Modeling | Create | Nodes | In Active CS

No.: 1, (x, y, z) = (0,0,0)

(2) Create Node 12建立节点12

Preprocessor | Modeling | Create | Nodes | In Active CS

No.: 2, (x, y, z) = (0,1,0)

(3) Fill Between Node 1 and 12在节点1，12间填充其余节点

Preprocessor | Modeling | Create | Nodes | Fill Between Nds

Number of nodes to fill: 10

Spacing ratio: 1(均匀网格)

(4) Create Node 13~24 by copying复制生成节点13～24

Preprocessor | Modeling | Copy | Nodes | Copy

Pick All选择所有节点

Total number of copies: 2复制2份（包含原先的1份）

X-offset: 0.1设置X方向偏移量

(5) Create Element 1生成单元1

Preprocessor | Modeling | Create | Elements | Auto Numbered | Thru Nodes

Select 1, 13, 14, 2(with mouse)

(6) Copy Element 2~10 by copying复制生成其余单元

Preprocessor | Modeling | Copy | Elements | Auto Numbered

Pick All选择所有单元

Total number of copies: 11复制11份（包含原先的1份）

Node number increment: 1设置节点增量

Applying Loads加载（设置边界条件和初始条件）

(1) Apply convention loads on Node 12 and 24在节点12，24上加对流载荷

Preprocessor | Loads | Define Loads | Apply | Thermal | Convection | On Nodes

Pick 12, 24

V ALI Film coefficient: 50换热系数

V AL2L Bulk temperature: 1000环境温度

(2) Set initial temperature(uniform temperature)设置初始条件（均匀温度）

Solution | Define Loads | Settings | Uniform Temp

Uniform Temperature: 0

Solution求解

(1) Set Analysis Type as Transient设置分析类型为瞬态分析

Solution | Analysis Type | New Analysis

Transient

(2) Set solution controls设置分析控制参数

Solution | Analysis Type | Sol’n Controls

”Transient” Label: Stepped Loading

”Basic” Label: Time at end of loadstep: 10000; Automatic time stepping: on; Time increment: 10;

Frequency: Write every substep

(3) Solve求解

Solution | Solve | Current LS

Viewing Results查看结果

(1) TimeHist Postpro时间历程后处理器

Add data添加数据:

TimeHist Postpro | Add data: Nodal Solution: DOF Solution: Nodal Temperature:

Variable Name: T1; Node 1

Variable Name: T5; Node 5

Variable Name: T9; Node 9

Variable Name: T11; Node 11

(2) List/Graph列表/作图

Select the variables选择变量:

List data/ Graph data

(3) Save image保存图片

Menu | PlotCtrls | Capture Image: File | Save as

(4) General Postpro通用后处理器

Select the data of certain time选择某一时刻的数据:

General Postpro | Read Results | By pick

Plot the contour map of temperature distribution绘制该时刻温度分布等值线图:

General Postpro | Plot Results | Contour Plot | Nodal Solu | Nodal Solution: DOF Solution: Temperature

(5) Save image保存图片

Menu | PlotCtrls | Capture Image: File | Save as

(6) Animate生成动画

Menu | PlotCtrls | Animate | Over Time

Number of animation frames: 100

Question 2: Consider a solid cylinder with initial temperature T0. The top surface of the cylinder is exposed to the environment of which the temperature is T e (III type boundary condition) and the other surfaces are heat insulation (II type boundary condition). Analyze the temperature distribution in the cylinder during the period of 1000s.

问题2：考虑一个初始温度为T0的圆柱体，一段暴露在温度为T e的环境中，其余界面视为绝热，分析其在1000s内温度分布情况。

Basic parameters基本物性参数

Geometry几何：r=0.025 m, h=0.05 m

Material材料：λ=25 W/m·o C, ρ=7800 kg/m3, c p=500 J/kg·o C Loads载荷：T0=25 o C, T e=100 o C, h=100 W/m2·o C

Jobname and directory settings设置文件名、存储路径

Menu | File | Change Jobname

Menu | File | Change Directory

Preprocessing前处理

(1) Define Element Type定义单元类型

Preprocessor | Element Type | Add/Edit/Delete

Thermal Mass: Solid : Brick 8node 70

(2) Set Material Properties设置材料属性

Preprocessor | Material Props | Material Models

Thermal: Conductivity: Isotropic KXX=25

Thermal: Density=7800

Thermal: Specific Heat=500

Modeling建模

(1) Create the cylinder model建立圆柱体模型

Preprocessor | Modeling | Create | V olumes | Cylinder | Solid Cylinder WP X: 0

WP Y: 0

Radius: 0.025

Depth: 0.05

(2) Adjust the view调整视图

Right Toolbar | Isometric View

(3) Mesh划分网格

Preprocessor | Meshing | MeshTool

SmartSize(optional): Mesh: select the cylinder选择圆柱体Applying Loads加载

(1) Apply convention loads on the top在上表面加对流载荷

Preprocessor | Loads | Define Loads | Apply | Thermal | Convection | On Areas

Pick the top surface by mouse选择上表面(用鼠标)

V ALI Film coefficient: 100换热系数

V AL2L Bulk temperature: 100环境温度

(2) Set initial temperature(uniform temperature)设置初始条件（均匀温度）

Solution | Define Loads | Settings | Uniform Temp

Uniform Temperature: 25

Solution求解

(1) Set Analysis Type as Transient设置分析类型为瞬态分析

Solution | Analysis Type | New Analysis

Transient

(2) Set solution controls设置分析控制参数

Solution | Analysis Type | Sol’n Controls

”Transient” Label: Stepped Loading

”Basic”Label: Time at end of loadstep: 1000; Automatic time stepping: on; Time increment: 10; Frequency: Write every substep

(3) Solve求解

Solution | Solve | Current LS

Viewing Results查看结果

(1) General Postpro通用后处理器

Select the data of certain time选择某一时刻的数据:

General Postpro | Read Results | By pick

Plot the contour map of temperature distribution绘制该时刻温度分布等值线图:

General Postpro | Plot Results | Contour Plot | Nodal Solu | Nodal Solution: DOF Solution: Temperature

(2) Save image保存图片

Menu | PlotCtrls | Capture Image: File | Save as

(3) Animate生成动画

Menu | PlotCtrls | Animate | Over Time

Number of animation frames: 100