2. Benchmark solution

2.1. Calculation method

This test case aims to compare two different formulations for fluid elements. We will therefore have exclusively numerical comparisons.

2.2. Reference quantities and results

In order to choose an interesting point of comparison, we plot the acceleration at the C post-treatment point with and without a fluid border in the case of formulation \((u,p)\). As can be observed in the, the absence of the fluid border causes a phase shift effect due to parasitic waves from the left border of the fluid.

Figure 2.2-a : Acceleration at post-treatment point C with and without a fluid absorbent border