Tech Briefs

Tutorial on ADINA FSI

The objective in this News is to give a tutorial on how to use ADINA in adaptive FSI. We use a problem of the ADINA Primer to demonstrate the features — Problem 49.

Analysis of a parachute using adaptive CFD

We consider the following FSI problem:

Figure 1 Schematic of problem considered

The shroud lines are attached to a fixed point and the air flows upwards around the parachute. This simulates the situation in which the parachute floats downwards through the air at a fixed speed. Some comments regarding the analysis —

It is desired to determine the total fluid force applied to the parachute and the final shape of the parachute.

Turbulent flow conditions are assumed and the k-ε turbulence model is used.

The steady-state solution is determined using a transient analysis in which the loads are held constant.

An axisymmetric analysis is performed. The shroud lines are modeled in a very approximate manner using a truss element. The parachute is also modeled in a very approximate manner using axisymmetric shell elements.

The details of how to perform the analysis using ADINA are given here:

Primer Problem 49: Analysis of a parachute using adaptive CFD

The final mesh reached and the solution obtained are given in the figures below. The above movie shows the response of the parachute largely calculated with a coarse mesh, but the final state is reached with the finest mesh (given below).

Figure 2 Detail of final mesh reached

Figure 3 Solution obtained

Another application of the ADINA FSI mesh adaptive capability was presented in an earlier News. For a summary of the FSI capabilities, see here.

For many additional problems spanning over the diverse and powerful analysis features of ADINA, see the ADINA Tutorials Page.

Fluid-structure interaction, adaptive meshing, parachute