FV3-2

https://docs.google.com/presentation/d/11SLZtjkZ1OIuCnYC4vnZ_uX4PntS-U6YgLSbQvkMd-U/edit?usp=sharing

Double slit experiment:

• A short experiment to understand the sensitivity of the Test case 2-b to the number of slit, which would represent better a mountain range. Mountain range are notoriously difficult to take into account in global Models and are important to understand some extreme phenomenon as medicanes.

  • Can we find some "interference" area?

  • Is there significant differences between the single slit and double slit experiment at low initial zonal wind speed?

• The formulation of the double slits is as follow:

• The distance between the slit is 10. Three different initial zonal wind speed have been tested: 5, 10, 20 m/s. Results for z=300m are seen below:

Observations:

• There seem to be a blocking forming at all tested initial zonal wind speed.

• Complex "interference" pattern seem to form depending on the initial zonal wind speed.

• An important negative flow is forming on the western side of the mountain range.

• Vortex forming on the side of the mountain range.

Next steps:

• Implementation of this test case on OpenIFS.

• Compute the sensitivity to:

  • The distance between the slits.

  • The width of the slits

  • The vertical temperature profile.

• Is there an analytical solution for the surface layer?

• Is this solution comparable with the simulations?