Development & Validation of the RANS ABL BC in AMR-Wind

This repo will include documentation, checklist, and validation of the RANS ABL boundary condition for AMR-Wind. Initial implementation will be for the k-omega RANS model.

Documentation

Check out the docs section for notes and literature.

Branch merging

For bleeding-edge testing

Branch with complete contributions (RANS ABL + mesh stretching):
https://github.com/lawrenceccheung/amr-wind/tree/ransabl_kitchensink

Note: additional changes may still be needed to improve stability/fix bugs.

For PR review

RANS ABL k-omega model merged branch for PR review: https://github.com/lawrenceccheung/amr-wind/tree/mesh_map_k_omega_merge

Branches to merge in:

• https://github.com/lawrenceccheung/amr-wind/tree/mesh_map_k_omega
• https://github.com/ashesh2512/amr-wind/commits/mesh_map_turb
• https://github.com/lawrenceccheung/amr-wind/tree/mesh_map_subsetsampling

Do not merge this one (yet):

• https://github.com/ashesh2512/amr-wind/tree/mesh_map_multi_lev

Things to do

Things to do for implemention

• Implement ABL stretching function

  • Blended stretching function defined in ABLScaling_function_blended.ipynb
  • Implement in ABLScaling.cpp

• Make a copy of KOmegaSST called KOmegaSSTABL

• Implement ABL initial condition

  • Edit ABL::initialize_fields to account for mesh mapping, sdr/tke init
  • Edit ABLFieldInit::operator() -- include mesh mapping
  • Edit ABLFieldInit::perturb_temperature for temperature
  • Edit ABLFieldInit::operator() -- initialize with M.O. profile?
  • Fill in ABLFieldInit::init_tke() -- use a profile?
  • Fill in ABLFieldInit::init_sdr() -- use a profile?

• Make changes to wall function BC

  • Add ABLTKEWallFunc/ABLSDRWallFunc infrastructure in ABLWallFunction.cpp
  • Edit ABL constructor to include RANS ABL inputs/capability
    • Cmu is now linked to beta_star in RANS variables
  • Register TKE/SDR wall functions in ABL::post_init_actions()
  • Edit ABLWallFunction::init_log_lawHeight()
  • Add phi calculations in MOData.H, MOData.cpp.
  • Add mu, epsilon, tke calculations in ShearStress.H.
  • Fill in ABLTKEWallFunc::wall_model()
  • Fill in ABLSDRWallFunc::wall_model()

• Make changes for k-epsilon model

  • Fill in ABLFieldInit::init_eps() -- use a profile?
  • call init_eps() in ABL::initialize_fields()
  • Register EPS wall functions in ABL::post_init_actions()
  • Create ABLEPSWallFunc() in ABLWallFunction.H & fill in wall model

Things to do for testing

Basic testing

• Create test harness for KOmegaSSTABL+wall model (proper inputs for 1 iteration test case, no mesh mapping)

  • see abl_komegasst.i

• Create test harness for KOmegaSSTABL+wall model+mesh mapping (proper inputs for 1 iteration test case, with mesh mapping)

  • see abl_komegasst_meshmap.i

SWIFT test cases

Neutral ABL case set up to match measured conditions from SWIFT test facility.

• Uniform grid

• Mesh mapped