Shock tube simulation project

Shock tube simulation project

1. Geometry and boundary flagging

2. Regions

3. Events

4. Pressure plots

Fig.1 Pressure (High pessure region)

Pressure drop can be seen in high pressure region as after o.oo1 seconds the regions are opened to each other imitating a removal of diaphragm. Rise in pressure again is due to shock waves built after hitting the wall on the low pressure region side and then pressure is again reduced and proceeds towards equillibrium, vice versa for the low pressure region.

Fig.2 Pressure (low pessure region)

5. Temperature Plots

Fig.1 High pessure region

Temperature drop is associated with decrease of pressure in the high pressure region and its rise after sometime is atributed to the gas species hitting the walls of the tube and gaining energy .

Fig.2 Low pessure region

6. Total cells

Total cells tend to increase as sgs embed (sub-grid criterion = minimum mass fraction of the selected species that will trigger AMR) was set at 0.001 , so when this limit is crossed the adaptive mesh refinement of 3 layers tend to increase the total cells

7. Mesh generation

Fig 1. Mesh at start

Fig 2. Mesh at the end