1. Plunger velocity = 52.5cm/s, water, acceleration time = 0.1 sec

2. Plunger velocity = 52.5cm/s, water, acceleration time = 0.2 sec

3. Plunger velocity = 52.5cm/s, water, acceleration time = 0.3 sec

4. Plunger velocity = 52.5cm/s, water, acceleration time = 0.4 sec

5. Plunger velocity = 52.5cm/s, water, acceleration time = 0.6 sec

6. Plunger velocity = 52.5cm/s, water, acceleration time = 0.7 sec
 
 

For coarse mesh, the effect of plunger acceleration on the wave pattern is not consistent.
See the effect of plunger acceleration for the fine mesh.