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Simple ConductionProf Charlton S. InaoDefence University

College of Engineering

Ansys LAB Heat transfer

PE -3011

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Preprocessing

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File>Change Jobname> “Heat Transfer”; File >change Title>”Simple Conduction

Problem”>Ok;Plot>Replot

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Preference>Thermal

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Preprocessing>Modeling>Create>Areas>Rectangle > By two Corners>Wp x=0,WP y=0, width=1, height=1

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Preprocessor > Element Type > Add/Edit/Delete... > click 'Add' > Select Thermal Solid, Quad

4Node 55

Define the type element

For this example, we will use PLANE55 (Thermal Solid, Quad 4node 55). This element has 4 nodes anda single DOF (temperature) at each node. PLANE55 can only be used for 2 dimensional steady-state ortransient thermal analysis

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Element Material PropertiesPreprocessor > Material Props > Material Models > Thermal > Conductivity > Isotropic > KXX =

10 (Thermal conductivity)MP,KXX,1,10

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Mesh SizePreprocessor > Meshing > Size Cntrls > ManualSize > Areas > All Areas > 0.05

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MeshPreprocessor > Meshing > Mesh > Areas > Free > Pick All

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Meshed area should look like this

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Solution Phase: Assigning Loads and Solving

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Define Analysis TypeSolution > Analysis Type > New Analysis >

Steady-State

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Apply Constraints

For thermal problems, constraints can be in the form of Temperature, Heat Flow, Convection, Heat Flux,

Heat Generation, or Radiation.

In this example, all 4 sides of the block have fixed temperatures. Solution > Define Loads > ApplyNote that all of the -Structural- options cannot be selected. This

is due to the type of element(PLANE55) selected. Thermal > Temperature > On Nodes Click the Box option (shown below) and draw a box around

the nodes on the top line.

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Reference Illustration

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Click the Box Option> Make a box to enclose all the nodes at the top most line as shown in the illustration below.

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Plot >Nodes ( select all the top nodes by enclosing in the box)

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Click the TEMP option >Constant Value of 500

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Orange triangles in the graphics window indicate the temperature contraints.

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Using the same method, constrain the remaining 3 sides to a constant value of

100

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Constraining the left nodes by a constant value of temperature of 100

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Putting a temperature constraint of 100 deg centigrade constant value to the bottom nodes

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Finally, putting a temperature constraint of 100 deg centigrade constant value to the right most

nodes

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Solve the SystemSolution > Solve > Current LS

Solution is done pop up box should appear, then Clear>Ok

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Post Processing PhaseGeneral Postproc > Plot Results > Contour Plot > Nodal Solution ... > DOF solution, Temperature

TEMP

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Ansys Actual Results,Maximum Thermal Stress at the red part at the top 500, Minimum thermal stress is exhibited at the left ,right and bottom side which

is 100

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Note

Note that due to the manner in which the boundary contitions were applied, the top corners are held at a

temperature of 100. Recall that the nodes on the top of the plate were constrained first, followed by the

side and bottom constraints. The top corner nodes were therefore first constrained at 500C, then

'overwritten' when the side constraints were applied. Decreasing the mesh size can minimize this effect,

however, one must be aware of the limitations in the results at the corners.

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End of Presentation

Thank You Very Much