v8.01.111 FDLV111 - Absorption of a pressure wave in a fluid column

Summary:

First order fluid paraxial elements intended to apply absorbent conditions at the border of a finite element mesh are tested to simulate infinity in direct transient calculations.

They are used to model an infinite fluid column, in 3D or 2D, in which a pressure wave is created using a piston. We are interested in the non-reflection of the wave at the « infinite » end of the column.

The two direct transient operators of*Code_Aster* are tested successively, namely DYNA_VIBRA and DYNA_NON_LINE.

• 1. Reference problem
  • 1.1. Geometry
  • 1.2. Material properties
  • 1.3. Boundary conditions and loads
  • 1.4. Initial conditions
• 2. Benchmark solution
  • 2.1. Benchmark results
  • 2.2. Uncertainties
  • 2.3. Bibliographical references
• 3. Modeling A: 3D case
  • 3.1. Characteristics of modeling
  • 3.2. Characteristics of the mesh
  • 3.3. Tested values
• 4. Modeling B: 2D case
  • 4.1. Characteristics of modeling
  • 4.2. Characteristics of the mesh
  • 4.3. Tested values
• 5. Summary of results