def setup_case():
   import numpy as np
   import sys


########### section 1 choice of differencing scheme ###########
   scheme='h'  #hybrid
   scheme_turb='h'  #hybrid upwind-central 

########### section 2 turbulence models ###########
   cmu=0.09
   kom  = False 
   keps = True
   c_eps_1=1.5
   c_eps_2 = 1.9
   prand_eps=1.4
   prand_k=1.4
#dummy vals
   c_omega_1 = 5./9.
   c_omega_2 = 3./40.
   prand_omega = 2.0
   urf_omega = 0.5

########### section 3 restart/save ###########
   restart = False
   save = True

########### section 4 fluid properties ###########
   viscos=3.57E-5

########### section 5 relaxation factors ###########
   urfvis=0.5
   urf_vel=0.5
   urf_k=0.5
   urf_p=1.0
   urf_eps=0.5

########### section 6 number of iteration and convergence criterira ###########
   maxit=2000
   min_iter=1
   sormax=5e-5

   solver_vel='lgmres'
   solver_pp='pyamg'
   solver_turb='gmres'

   nsweep_vel=50
   nsweep_pp=50
   nsweep_turb=50
   convergence_limit_u=-1e-6
   convergence_limit_v=-1e-6
   convergence_limit_k=-1e-6 # use absolute conv. criterion
   convergence_limit_om=-1e-6 # use absolute conv. criterion
   convergence_limit_eps=-1e-6 # use absolute conv. criterion
   convergence_limit_pp=5e-2

########### section 7 all variables are printed during the iteration at node ###########
   imon=ni-10
   jmon=int(nj/2)

########### section 8 save data for post-processing ###########
   vtk=False
   save_all_files=False
   vtk_file_name='bound'

########### section 9 residual scaling parameters ###########
   uin=1
   resnorm_p=uin*y2d[1,-1]
   resnorm_vel=uin**2*y2d[1,-1]


########### Section 10 boundary conditions ###########

# boundary conditions for u
   u_bc_west=np.ones(nj)
   u_bc_east=np.zeros(nj)
   u_bc_south=np.zeros(ni)
   u_bc_north=np.zeros(ni)

   u_bc_west_type='d' 
   u_bc_east_type='n' 
   u_bc_south_type='d'
   u_bc_north_type='n'

# boundary conditions for v
   v_bc_west=np.zeros(nj)
   v_bc_east=np.zeros(nj)
   v_bc_south=np.zeros(ni)
   v_bc_north=np.zeros(ni)

   v_bc_west_type='d' 
   v_bc_east_type='n' 
   v_bc_south_type='d'
   v_bc_north_type='d'

# boundary conditions for p
   p_bc_west=np.zeros(nj)
   p_bc_east=np.zeros(nj)
   p_bc_south=np.zeros(ni)
   p_bc_north=np.zeros(ni)

   p_bc_west_type='n'
   p_bc_east_type='n'
   p_bc_south_type='n'
   p_bc_north_type='n'

# boundary conditions for k
   k_bc_west=np.ones(nj)*1e-2
   k_bc_west[10:]=1e-5
   k_bc_east=np.zeros(nj)
   k_bc_south=np.zeros(ni)
   k_bc_north=np.ones(ni)*1e-5

   k_bc_west_type='d'
   k_bc_east_type='n'
   k_bc_south_type='d'
   k_bc_north_type='n'

# boundary conditions
   eps_bc_west=np.ones(nj)*1e-8
   eps_bc_east=np.zeros(nj)
   eps_bc_south=np.zeros(ni)
   eps_bc_north=np.zeros(ni)

   eps_bc_west_type='d'
   eps_bc_east_type='n'
   eps_bc_south_type='d'
   eps_bc_north_type='n'

   return