Dragon Whistle simulation

[CharanSai]

I am working on a project which works on a principle of Dragon whistle simulation (spiral fabric tube linear inflation/straightening inflation caused by Air velocity from one fixed inlet as shown in the attached image).
is this can be done with co-simulation of CFD and structural interaction
or Coupled Eulerian Lagrangian ?
can anyone please suggest me the steps to achieve this kind of simulation
it's great if you can share best suitable tutorial for the same.

 

[FEA way]

Like a party horn ? Interesting. Newer versions of Abaqus don't have the CFD capabilities so you would have to couple Abaqus with some CFD software or use CEL for that.

 

[CharanSai]

Yes, Can I have the steps to get this done with CEL

 

[FEA way]

1. Create solid (Lagrangian) part (pipe) in a standard way. You will need a hyperelastic material model.
2. Create Eulerian part in the form of the whole region where the air can be during the simulation (it should extend beyond the pipe to account for its large deformation.
3. Create a partition in the Eulerian part where the air will be initially.
4. Mesh the Eulerian part with Eulerian elements and assign Eulerian section (referencing a material with density, viscosity and EOS specification).
5. Use the Material assignment type of initial predefined field and set 1 for air (0 for Void) to the region defined in step 3. The rest of the Eulerian domain will be void (initially empty).
6. Apply velocity boundary conditions.
7. Define general contact which will handle the interaction between the Lagrangian and Eulerian domain.
8. Request EVF for field output.

Instead of step 3, after meshing the Eulerian part, you could use the Volume Fraction Tool (type of a discrete field) and define the initial fluid location as the inside of an additional reference part (volume inside the pipe). In this case, you can exclude the reference part from the simulation (no need to mesh it either). Then choose the previously created discrete field in the initial material assignment for the Eulerian part. This approach is particularly useful when the initial fluid domain has a complex shape (e.g. due to objects immersed in fluid).