Ansys thermal tutorial
- 1. ANSYS THERMAL TUTORIAL Thermal - Mixed Boundary Example (Conduction/Convection/Insulated) Introduction This tutorial was created using ANSYS 7.0 to solve simple thermal examples. Analysis of a simple conduction as well a mixed conduction/convection/insulation problem will be demonstrated. The Mixed Convection/Conduction/Insulated Boundary Conditions Example is constrained as shown in the following figure (Note that the section is assumed to be infinitely long): Preprocessing: Defining the Problem 1. Give example a Title 2. Open preprocessor menu ANSYS Main Menu > Preprocessor /PREP7
- 2. 3. Create geometry Preprocessor > Modeling > Create > Areas > Rectangle > By 2 Corners > X=0, Y=0, Width=1, Height=1 BLC4,0,0,1,1 4. Define the Type of Element Preprocessor > Element Type > Add/Edit/Delete... > click 'Add' > Select Thermal Mass Solid, Quad 4Node 55 ET,1,PLANE55 As in the conduction example, we will use PLANE55 (Thermal Solid, Quad 4node 55). This element has 4 nodes and a single DOF (temperature) at each node. PLANE55 can only be used for 2 dimensional steady-state or transient thermal analysis. 5. Element Material Properties Preprocessor > Material Props > Material Models > Thermal > Conductivity > Isotropic > KXX = 10 MP,KXX,1,10 This will specify a thermal conductivity of 10 W/m*C. 6. Mesh Size Preprocessor > Meshing > Size Cntrls > ManualSize > Areas > All Areas > 0.05 AESIZE,ALL,0.05 7. Mesh Preprocessor > Meshing > Mesh > Areas > Free > Pick All AMESH,ALL Solution Phase: Assigning Loads and Solving 1. Define Analysis Type Solution > Analysis Type > New Analysis > Steady-State ANTYPE,0 2. Apply Conduction Constraints
- 3. In this example, all 2 sides of the block have fixed temperatures, while convection occurs on the other 2 sides. o Solution > Define Loads > Apply > Thermal > Temperature > On Lines o Select the top line of the block and constrain it to a constant value of 500 C o Using the same method, constrain the left side of the block to a constant value of 100 C 3. Apply Convection Boundary Conditions o Solution > Define Loads > Apply > Thermal > Convection > On Lines o Select the right side of the block. The following window will appear: o Fill in the window as shown. This will specify a convection of 10 W/m2 *C and an ambient temperature of 100 degrees Celcius. Note
- 4. that VALJ and VAL2J have been left blank. This is because we have uniform convection across the line. 4. Apply Insulated Boundary Conditions o Solution > Define Loads > Apply > Thermal > Convection > On Lines o Select the bottom of the block. o Enter a constant Film coefficient (VALI) of 0. This will eliminate convection through the side, thereby modeling an insulated wall. Note: you do not need to enter a Bulk (or ambient) temperature You should obtain the following: 5. Solve the System Solution > Solve > Current LS SOLVE Postprocessing: Viewing the Results 1. Results Using ANSYS Plot Temperature General Postproc > Plot Results > Contour Plot > Nodal Solu ... > DOF solution, Temperature TEMP