Fluid formulations.  
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| subroutine  | fluid_scheme_init_common (this, msh, lx, params, scheme, user, kspv_init) | 
|   | Initialise a fluid scheme.  
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| subroutine  | fluid_scheme_init_all (this, msh, lx, params, kspv_init, kspp_init, scheme, user) | 
|   | Initialize all components of the current scheme.  
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| subroutine  | fluid_scheme_free (this) | 
|   | Deallocate a fluid formulation.  
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| subroutine  | fluid_scheme_validate (this) | 
|   | Validate that all fields, solvers etc necessary for performing time-stepping are defined.  
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| subroutine  | fluid_scheme_bc_apply_vel (this, t, tstep) | 
|   | Apply all boundary conditions defined for velocity Here we perform additional gs operations to take care of shared points between elements that have different BCs, as done in Nek5000.  
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| subroutine  | fluid_scheme_bc_apply_prs (this, t, tstep) | 
|   | Apply all boundary conditions defined for pressure.  
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| subroutine  | fluid_scheme_solver_factory (ksp, n, solver, max_iter, abstol, monitor) | 
|   | Initialize a linear solver.  
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| subroutine  | fluid_scheme_precon_factory (pc, ksp, coef, dof, gs, bclst, pctype) | 
|   | Initialize a Krylov preconditioner.  
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| subroutine  | fluid_scheme_set_usr_inflow (this, usr_eval) | 
|   | Initialize a user defined inflow condition.  
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| real(kind=rp) function  | fluid_compute_cfl (this, dt) | 
|   | Compute CFL.  
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| subroutine  | fluid_scheme_set_bc_type_output (this, params) | 
|   | Set boundary types for the diagnostic output.  
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| subroutine  | fluid_scheme_update_material_properties (this) | 
|   | Update the values of mu_field if necessary.  
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| subroutine  | fluid_scheme_set_material_properties (this, params, user) | 
|   | Sets rho and mu.  
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