Assignment 2-RADIOSS Engine File Editing & 3D Meshing Challenge

1. 1. Check the material properties of the rail component and calculate the speed of sound in steel rail=_______
2. 2. The length of the rail is about 1000 mm.calculate the time takes for a shock wave to travel from one end of the rail to the other.

3.Time for sound to travel length of rail=______

4.Edit the engine file so that the stress wave can be monitored, moving from one end of the rail to the other during impact -this will require a termination time equal to the time it takes for the sound to travel the length of the rail(set on/RUN card)

5.Set the frequency of animation output to a time that will give 20 animation steps(/ANIM/DT)

6.Change /print -10.

ANS:

Data from the FIRST_RUN_0000.rad File

C= Speed of Sound

C=`√E/rho`

C= `√210000/0.0078`

C=5188.74 mm/s

Time step=l/C

∆t=1000/5188.74 = 0.192 seconds = 192 ms

• The time stop is set to 192 ms as the time is in milliseconds.

• The animation frequency is set to 20

• .Change /print -10 is set

RUN file:

• Run time is set.

• Animation frequency is set.

3d meshing tetra mesh and hex mesh

Housing Model:

3D Meshing:

Elements sizes: Min- 2mm, Target- 5mm, Max- 7mm

Tet collapse: 0.15

1. Create Teramesh for Housing

Importing the model.

• Delete the solids if any exists.

• Surface cleanup is done before 2D meshing.

Creation of Mesh: 2D -- > automesh

• 2D mesh model is created with only trias with the target element size of 5mm, in order to create tetramesh.

• All the min element size are correct and elements with min size less than 2mm are brought to zero.

• All the max element size are correct and elements with max size more than 7mm are brought to zero.

Creation of 3DMesh: 3D -- > tetramesh

• Select the Tetra mesh option.
• Select all the 2D elements to create the tetramesh.

• 3D tetramesh is created.

• Check all the 3D elements for tet collapse of 0.15 (required criteria).
• If any elements fail, they need to be corrected.

Similarly:-

• Manual cleanup is done and component is ready for 2d mesh.
• 2D mesh model is created with only trias with the target element size of 5mm, in order to create tetramesh.

• All the max element size are correct and elements with max size more than 7mm are brought to zero.

Creation of 3DMesh: 3D -- > tetramesh

• 3D tetramesh is created.
• Check all the 3D elements for tet collapse of 0.15 (required criteria).

If any elements fail, they need to be corrected.

Hex mesh:

• Model is imported.

• 2D mesh is first created with target element size of 10mm.

• 2D mesh is created.

• Go to 3D -- > line drag.
• Select the elements and line along the elements are to be dragged.

• 3D hexa elements are created.

• Go to 3D -- > spin
• Select the element which are to be spined.
• And enter the other required data.

• Spin elements are created.

• Go to TOOL -- > find faces
• Select the elements whose faces are to be created and click find faces to create them.
• Required Faces are created.

• Create the same equal number of elements on the other surface.

• Go to 3D -- > linear solid
• Select the from and to elements and enter other required data and click solids to create the hexa mesh.

• Hexa mesh is created

• Go to auto mesh and create 2d mesh with corresponding flowing mesh.

• Go to 3D -- > solid map.
• Select the source geom and destination geometry
• Select the along part nodes
• And select the element to drag and click mesh to create the hexa mesh.

• The final model of hexa mesh.