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ABAQUS热仿真分析.pdf

发布时间：2022-06-08 发布人：admin 分类：说明书 资料大小：1.10M 资料格式：pdf 举报 版权申诉
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    Module 2 Heat Transfer Analysis Formulate a 2-D FE model and solve for (i) the temperature distribution within the concrete Type of solver: ABAQUS CAE/Standard (A) Two-Dimensional Steady-State Problem – Heat Transfer through Two Walls Problem Description: The figure below depicts the cross-sectional view of a furnace constructed from two materials. The inner wall is made of concrete with a thermal conductivity of kc = 0.01 W m-1 K-1. The outer wall is made of bricks with a thermal conductivity of kb = 0.0057 W m-1 K-1. The temperature in the furnace is at 1273 K and the convective heat transfer coefficient is h1 = 0.208 W m-2 K-1. The outer brick wall comes into contact with the ambient air, which is at 293 K, and the corresponding convective heat transfer coefficient is h2 = 0.068 W m-2 K-1. and brick walls at steady-state conditions, and (ii) the heat flux across the walls. 43
    Module 2 SOLUTION: • Start ABAQUS/CAE. At the Start Session dialog box, click Create Model Database. • From the main menu bar, select ModelCreate. The Edit Model Attributes dialog box appears, name the model 2D_Walls A. MODULE  PART Under the Part module, we will construct the two parts (i.e. walls): (i) Brick and (ii) Concrete 1. From the main menu bar, select PartCreate 2. The Create Part dialog box appears. Name the part Brick and fill in the rest of the options as in Fig.A1. Click Continue to create the part. 3. There are several ways of constructing the brick wall geometry. One way to do this is demonstrated here: (a) From the Sketcher toolbox, select the Create Isolated Point tool , then type in coordinates of the four key vertices (0, 0), (0.9, 0.9), (2.1, 2.1) and (3, 3). If not all plotted points are visible, press the Auto Fit View button the toolbar. located on (b) From the Sketcher toolbox, select the Create Lines: Rectangle tool vertices to form two squares, as shown in Fig.A2. and connect the inner and outer pairs of (c) Click on Done in the prompt area. Fig.A2 Fig.A1 44
    Module 2 4. Now construct the second part by following procedures similar to the ones outlined above. Name the new part Concrete. The four key vertices are (0, 0), (0.1, 0.1), (1.1, 1.1) and (1.2, 1.2). B. MODULE  PROPERTY (a) To define the materials:- 1. From the main menu bar, select MaterialCreate 2. The Edit Material dialog box appears (see Fig.B1). Name it Material-brick. Select ThermalConductivity and enter a value of 0.0057. 3. Click OK. 4. Now create Material-concrete. Enter a value of 0.01 as its thermal conductivity. (b) To define the sections:- 1. From the main menu bar, select SectionCreate 2. The Create Section dialog box appears (Fig.B2). Name it Section-brick. In the Category list, accept Solid as the default selection. In the Type list, accept Homogeneous as the default selection, and click Continue. 3. The section editor appears (Fig.B3). Click the arrow next to the Material text box and choose Material-brick. Accept the default value for Plane stress/strain thickness, and click OK. 4. Now define Section-concrete. (c) To assign a section to a part:- 1. From the main menu bar, select AssignSection 2. Click on the Brick region and then click Done. 3. The Edit Section Assignment dialog box appears containing a list of existing sections, Click the arrow next to the Section text box and choose Section-brick, Fig.B1 Fig.B2 Fig.B3 45
    Module 2 and click OK. Note: the colour of a part becomes aqua when it has been assigned a section. 5. Now assign Section-concrete to the concrete region. C. MODULE  ASSEMBLY 1. From the main menu bar, select InstanceCreate 2. The Create Instance dialog box appears (Fig.C1). Under Parts, select Brick. For Instance Type, choose Independent (mesh on instance). Toggle on Auto-offset from other instances. Click OK. 3. Now create an instance for the part Concrete. 4. At this point, before we proceed onto assembling the instances, Fig.C1 it would be useful to define several sets of surfaces for use in later stages of the analysis. From the main menu bar, select ToolsSurfaceCreate. The Create Surface dialog box appears. Name it Brick-inside and pick the four edges located inside the Brick instance, see Fig.C2 (Note: you may need to press and hold the Shift-key to make multiple selections). Click Done in the prompt area. Repeat to create another set of surface called Brick- outside, consisting of four edges located outside the Brick instance, see Fig.C2. 5. Now create the following surfaces on the Concrete instance, name them: Concrete-inside and Concrete-outside, corresponding to the four inner and outer edges of the Concrete instance, as depicted in Fig.C2. Fig.C2 46
    Module 2 6. We’ll now assemble the two instances. From the main menu bar, select InstanceTranslate. Select the Concrete instance and click Done. By picking the suitable start and end points for the translation vector, position the smaller concrete wall within the larger brick wall, so that the final assembly resembles Fig.C3. D. MODULE  STEP 1. From the main menu bar, select StepCreate 2. The Create Step dialog box appears (Fig.D1), name it Heating, and select Heat transfer under Procedure type. Click Continue. Fig.C3 3. The Edit Step dialog box appears. Under the Basic tab, toggle Fig.D1 on Steady-state, click OK. 4. From the main menu bar, select OutputHistory Output RequestsCreate, accept the default name H-Output-1, the Edit History Output dialogue box appears, expand the Thermal button and toggle on FTEMP. Click OK. E. MODULE  INTERACTION (a)To tie the nodes at the interfaces:- 1. From the main menu bar, select ConstraintCreate 2. The Create Constraint dialog box appears, name it Interface and under Type pick Tie. Click Continue. Note: since we assume there is no thermal resistance across the brick-concrete wall interface, the Tie constraint will equate temperatures at the matching nodes. 47
    Module 2 Fig.E1 3. In the prompt area, choose the master type as Surface, button at the lower right hand click on the corner of the prompt area. Select Brick-inside and click Continue. Click the Surface button in the prompt area and select Concrete-outside as the slave surface. Click Continue. 4. The Edit Constraint dialog box appears (Fig.E1), accept the default settings and click OK. (b) To assign convective heat transfer conditions:- 1. From the main menu bar, select InteractionCreate 2. The Create Interaction dialog box appears (Fig.E2), name it Int-InnerWalls. Under Step, choose Heating. For Types for Selected Step, choose Surface film condition, click Continue. In the Region Selection dialog box, select the surface defined earlier as Concrete-inside and click Continue. Note: if the Region Selection dialog box does not appear, click on the bottom right hand corner of the prompt area. button at the 3. The Edit Interaction dialog box appears (Fig.E3), enter 0.208 (W m-2 K-1) as the Film coefficient, and 1273 (K) as the Sink temperature. 4. Now create surface film condition for the brick walls that are in contact with the ambient air, name it Int-OuterWalls. Apply it to the surface called Brick-outside. Enter 0.068 (W m-2 K-1) as the Film coefficient, and 293 (K) as the Sink temperature. Fig.E2 Fig.E3 48
    Module 2 F. MODULE  MESH (a) To seed the part instance:- 1. From the main menu bar, select SeedInstance 2. Left click on the Brick region, click Done in prompt area. The Global Seeds dialog box appears, enter 0.1 for Approximate global size, accept the rest of the settings and click OK. 3. By following the above steps, now apply an Approximate global seed size of 0.02 to the Concrete region. (b) To assign mesh controls:- 1. From the main menu bar, select MeshControls 2. Select both the Brick and Concrete regions, you can do this by dragging a box across them. Click Done (on the prompt area). 3. The Mesh Controls dialog box appears, follow the settings depicted in Fig.F1. Ensure that Medial axis algorithm is chosen. Fig.F1 Fig.F2 (c) To assign element type:- 1. From the main menu bar, select MeshElement Type 2. Select both regions. Click Done. 3. The Element Type dialog box appears (Fig.F2), under the Family list, ensure that Heat transfer is selected. The element type to be assigned is DC2D4. (d) To mesh the part instance:- 1. From the main menu bar, select MeshInstance 2. Select both regions. Click Done. The generated mesh should resemble Fig.F3. Fig.F3 49
    Module 2 G. MODULE  JOB (a) To create a new job:- 1. From the main menu bar, select JobCreate 2. The Create Job dialog box appears, enter Job-2D-Thermal. Click Continue. 3. The Edit Job dialog box appears, accept the default settings and click OK. (b) To submit the job:- 1. From the main menu bar, select JobManager 2. The Job Manager dialog box appears (Fig.G1), select Job-2D-Thermal and click on the Submit button. To see the progress of the analysis, and to monitor error and warning messages, click the Monitor button to bring up the Monitor dialog box (Fig.G2). (c) To analyse the results:- When the job is Completed, click on the Results button on the Job Manager dialog box (Fig.G1). Note: If the job fails to complete, go back to the Monitor dialog box (Fig.G2) and examine the messages under Errors and Warnings tabs, which often will provide clues on how to troubleshoot the analysis. Fig.G1 Fig.G2 50
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