ANSYS AUTODYN-Ship Blast

Workshop Goal and Procedure

Goal:

Model an air blast and underwater shock loading of a ship

Procedure:

Set up the problem in Explicit Dynamics (ANSYS)

Transfer the setup to AUTODYN

Add an Euler Part to model the air blast / underwater shock

Run the analysis in AUTODYN

Step 1 – Start Workbench

Start ANSYS Workbench and follow the sequenced steps using the

abbreviations shown below:

–DC = Double Click with Left Mouse Button

–SC = Single Click with Left Mouse Button

–RMB = Right Mouse Button Selection

–D&D = Drag and Drop = Hold Left Mouse Button down on item while dragging it to new location and then release it (i.e., Copy or Move)

Throughout these Workshops, the procedures shown are not always the only way to accomplish the desired tasks, so feel free to investigate other methods via the documentation when outside of this course

-The workshops consistently use RMB in the Outline tree to access options

whenever possible

.Often these options can also be accessed through the “Context” Toolbar

.Sometimes these options can also be accessed using RMB in the View area

Step 2 – Initiate an Explicit Dynamics (ANSYS) Project

2.a Create an Explicit Dynamics (ANSYS) Project

2.b Select MKS for the Project Units and request Native Applications

in Workbench have their values Displayed in the Project Units

Step 3 – Import the Geometry

3.a Import the geometry database ship_blast.agdb as shown below

Step 4 – Edit the Model in Mechanical

4.a Edit the model in Workbench Mechanical.

4.b Select the MKS Units system

–Recall that Mechanical is not native in Workbench, so the Units here may not match the Project Units

Step 5 – Make the Ship a Rigid Body

Step 6 – Generate the Default Mesh

6.a Generate the default mesh

Step 7 – Define an Initial Condition

7.a Apply an Initial Velocity Condition to the Ship as shown.

7.b Choose Define by Components: Y = 1.0 m/s

This step is only required because before linking to AUTODYN, you must complete the input for Explicit Dynamics by defining either a Boundary Condition or an Initial Condition (even though this problem setup requires neither).

The assigned value of the velocity is not important as it will be removed in AUTODYN

Step 8 – Define the Analysis Settings

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