Ansys Example 0153 Offshore Structure

Course in ANSYS Example0153

ANSYS Computational Mechanics, AAU, Esbjerg

Example – Offshore structure F Objective: Display the deflection figure and von Mises stress distribution Tasks: Import geometry from IGES. Display the deflection figure? Display the von Mises stress distribution? E = 210000N/mm2 n = 0.3 F = -10000

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Example – Offshore structure

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Example – Import IGES Utility Menu > File > Import > IGES

Press OK

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Example – Import IGES

Browse to find offshore-structure-skeleton.igs Press OK

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Example - Display

Select Front View

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Example - Numbering

Set Keypoint numbers On Set Line numbers On ANSYS Computational Mechanics, AAU, Esbjerg

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Example - Numbering

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Example – Element Type Preprocessor > Element Type > Add/Edit/Delete

Press Add

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Example - Element Type Preprocessor > Element Type > Add/Edit/Delete

Press Options Press Help to learn more about the element. ANSYS Computational Mechanics, AAU, Esbjerg

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Example – Real Constants Preprocessor > Real Constants > Add

Place the cursor on the relevant element and press OK

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Example - Real Constants Preprocessor > Real Constants > Add Enter OD=60 and TKWALL=3 Enter OD=40 and TKWALL=3 Enter OD=26 and TKWALL=2 Enter OD=30 and TKWALL=2

Add 4 Sets

Press Close to finish

Press OK ANSYS Computational Mechanics, AAU, Esbjerg

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Example - Material Properties Preprocessor > Material Props > Material Models

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Double Click to step in the material tree

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Example - Material Properties Preprocessor > Material Props > Material Models Enter: Modulus of elasticity

Click here to Close

Enter: Poisson’s ratio

Press OK

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Example – Mesh Attributes Preprocessor > Meshing > Mesh Attributes > Line Attributes > Picked Lines Select Line L7, L1, L8

Press OK ANSYS Computational Mechanics, AAU, Esbjerg

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Example – Mesh Attributes

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Example – Mesh Attributes Preprocessor > Meshing > Mesh Attributes > Line Attributes > Picked Lines Select Line L5, L4, L6

Change to 2 2

Press OK ANSYS Computational Mechanics, AAU, Esbjerg

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Example – Mesh Attributes

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Example – Mesh Attributes Preprocessor > Meshing > Mesh Attributes > Line Attributes > Picked Lines Select Line L2

Change to 3 3

Press OK ANSYS Computational Mechanics, AAU, Esbjerg

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Example – Mesh Attributes

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Example – Mesh Attributes Preprocessor > Meshing > Mesh Attributes > Line Attributes > Picked Lines Select Line L3

Change to 4 4

Press OK ANSYS Computational Mechanics, AAU, Esbjerg

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Example – Mesh Attributes

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Example - Meshing Preprocessor > Meshing > Size Cntrls > ManualSize > Lines > Picked Lines

Select/Pick Lines to specify mesh size for

Press OK when finish with selection ANSYS Computational Mechanics, AAU, Esbjerg

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Enter 2 for L7 3 for L6 4 for L1,L4,L5 5 for L8 23

Example - Meshing Preprocessor > Meshing > Mesh > Lines

Select individual lines to be meshed by Picking

NB: It is often necessary to “Clear” the model for example if Element Type is to be changed

Select all lines defined to be meshed

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Example – Size and Shape

Press OK ANSYS Computational Mechanics, AAU, Esbjerg

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Switch to On 25

Example – Display of element

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Example – Analysis Type File > Write DB log file Enter “example0153.lgw”

Solution > Analysis Type > New Analysis

Press OK

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Example – Define Loads Solution > Define Loads > Apply > Structural > Displacement > On Lines Select line L7, L1, L8

Select UX

Press OK ANSYS Computational Mechanics, AAU, Esbjerg

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Example – Define Loads Solution > Define Loads > Apply > Structural > Displacement > On Keypoints Select keypoint 10 Select All DOF

Press OK ANSYS Computational Mechanics, AAU, Esbjerg

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Example – Define Loads Solution > Define Loads > Apply > Structural > Force/Moment > On Keypoints Select keypoint 16

Change to FY

Press OK to finish ANSYS Computational Mechanics, AAU, Esbjerg

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Enter -10000 30

Example – Boundary Conditions

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Example - Solve Solution > Solve > Current LS

Press OK

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Example - PostProcessing General Postproc > Plot Results > Deformed Shape

Select “Def+undeformed” and Press OK

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Example – Deformed Shape

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Example – Contour Plot

Press OK ANSYS Computational Mechanics, AAU, Esbjerg

Select Stress, von Mises SEQV Example0153

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Example – Contour Plot

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Example – Comments/Questions • Could the model be modeled with beam elements instead of pipe elements? • The “example0153.lgw” can be edited in “Notepad” • Will the number of elements affect the solution?

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File menu You can include commands to be executed when the program starts up in the start71.ans file.

Clears (zeros out) the database stored in memory. Clearing the database has the same effect as leaving and reentering the ANSYS program, but does not require you to exit. ANSYS Computational Mechanics, AAU, Esbjerg

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