Tutorial 17 - CEL - Boat
Tutorial 17 - CEL - Boat
Tutorial 17 - CEL - Boat
1.
Introduction
In this tutorial, you will create a CEL model of a boat floating on a wavy sea.
sea A
rigid gate will be put in contact with the water and used to create waves.
Preliminaries
- The equation of state used to model the hydrodynamic behaviour of the sea is
defined in terms of Us-Up
Up model. For more information about this modelling
approach, refer to the Abaqus documentation. (Abaqus Analysis Users manual.
Chapter 25)
- The model is based on the SI units based on meters. Thus viscosity should be
assigned in Pa*s.
- A rigid body assumption is made for the boat and the gate to simplify the
solution and reduce the computational cost.
2.
3.
Enter the property module and define the two material models for the steel and
water.
1. Go into the Property Module and click the Create Material icon. In the Edit
Material dialog box, name the material Steel.. From the material editors menu
bar, select Mechanical Elasticity Elastic. Enter a Young modulus value of
210e+9 Pa and a Poisson ratio of 0.35.
0.35 Select General Density
ty and enter a
value of 1500 kg/m3. Click OK to exit the material editor.
2. Click the Create Material icon to create the water material mdoel.
mdoel In the Edit
Material dialog box, name the material Water.. From the material editors menu
bar, select Mechanical Eos and Us-Up as equation of state type.
type Enter a c0
value of 1483 and 0 for s and gamma0. Select General Density
ty and enter a
value of 1000 kg/m3. Select
elect Mechanical Viscosity and enter a value of 0.001
Pa*s. Click OK to exit the material editor.
4.
of the gate, the second at the centre of the boat as shown in the following picture.
In order to create this reference point, first define a datum point (Tools
datum)
3. Enter the step module and create two dynamic explicit steps. The first step
called Step-Gravity with duration of 2s and the second step called StepAdvance with duration of 10 s.
In the first step, the gravitational force will be gradually applied to the whole
model to simulate the boat floating on water. Then, the boat will be horizontally
displaced in the second step.
step
4. In the model tree, click on the History Output Requests and create a new
history Output from Step-Gravity
Gravity selecting the set BOAT-RP
BOAT RP as region and the
rotations UR as output.
5. In the Field Output requested by default, make sure that the EVF variable has
been selected. Then modify the number of intervals in which Abaqus saves the
solution entering the value 10 for the Step-gravity
Step
and 100 for Step--Advance. Edit
the field output states by exploding the Field Output requests container and
double-clicking
clicking on the step names.
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5.
Mesh
Enter the mesh module and create the meshes for both solid and Eulerian parts.
6.
Interactions
3. Use the Volume Fraction Tool to create a new discrete field by calculating
ca
how much material is present in every Eulerian element. Click on Tools
Discrete field
part. At this point you can suppress the Initial instance from the assembly.
7.
Tools
Amplitude Plotter
otter to plot the shape
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8.
Job module
Enter the Job module and create a new Job called CEL-BOAT. Select as many
processors (up to 6) as you have
have available in the parallelization tab, submit the
job and monitor the convergence.
9.
Results visualization
visualizat
At the end of the simulation, enter the Visualization module by clicking results in
the Job manager.
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a. Colour the parts by part instances by selecting the colouring strategy in the
horizontal toolbar and click on the View cut Manager in the vertical toolbar.
Here, click on EVF_VOID to only show the elements of the Eulerian part
containing material. Then, animate
animate the solution to view the results.
b. In the vertical Toolbar, select the Plot contours on deformed shape icon and
view the SVAVG Mises contour map,
map, then Animate the solution. From the
Result
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c. In the vertical toolbar, click on the Create XY data from history output, select
and plot the UR3 data saved at the Boat reference point.
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