REMORA_InitAnalyticProb_ParticleAdvectionFlat.H

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    // Whether this run carries a passive dye tracer. nComp() cannot answer this: with
    // biology active and no dye, Tracer_comp is the first biology component, so testing
    // nComp() would write the dye initial value into NO3.
    const bool l_do_dye = (remora.num_passive_scalars() > 0);
    ParmParse pp_prob("remora.prob");
    Real u_0  = Real(0.0); pp_prob.query("u_0", u_0);
    Real v_0  = Real(0.0); pp_prob.query("v_0", v_0);
    Real z0   = Real(0.1); pp_prob.query("z0", z0);     // Surface Roughness
    Real zRef = Real(80.); pp_prob.query("zRef", zRef); // Reference Height
    Real uRef = Real(0.0); pp_prob.query("uRef", uRef); // Reference Wind Speed
 
    auto geomdata = geom.data();
    const int khi = geomdata.Domain().bigEnd()[2];
 
    bool l_use_salt = m_solverChoice.use_salt;
 
    for (MFIter mfi(mf_cons, TilingIfNotGPU()); mfi.isValid(); ++mfi)
    {
        const Box &bx = mfi.tilebox();
        AMREX_ALWAYS_ASSERT(bx.length()[2] == khi+1);
 
        Array4<      Real> const& state = mf_cons.array(mfi);
        Array4<      Real> const& x_vel = mf_xvel.array(mfi);
        Array4<      Real> const& y_vel = mf_yvel.array(mfi);
 
        Array4<const Real> const& z_r = remora.vec_z_r[lev]->const_array(mfi);
 
        Real S0 = m_solverChoice.S0;
        Real T0 = m_solverChoice.T0;
        ParallelFor(bx, [=] AMREX_GPU_DEVICE(int i, int j, int k) noexcept
        {
            // Geometry (note we must include these here to get the data on device)
            // const auto prob_lo         = geomdata.ProbLo();
            // const auto dx              = geomdata.CellSize();
 
            // const Real x = prob_lo[0] + (i + 0.5) * dx[0];
            // const Real y = prob_lo[1] + (j + 0.5) * dx[1];
            const Real z = z_r(i,j,k);
 
            state(i, j, k, Temp_comp) = one;
 
            state(i,j,k,Temp_comp)=T0+Real(8.0)*std::exp(z/Real(50.0));
            if (l_use_salt) {
                state(i,j,k,Salt_comp)=S0;
            }
 
            // Set tracer = 0 everywhere
            if (l_do_dye) { state(i, j, k,Tracer_comp) = zero; }
        });
 
        // Construct a box that is on x-faces
        const Box& xbx = surroundingNodes(bx,0);
        // Set the x-velocity
        ParallelFor(xbx, [=] AMREX_GPU_DEVICE(int i, int j, int k) noexcept
        {
            const Real z = -z_r(i,j,k);
 
            // Set the x-velocity
            x_vel(i, j, k) = u_0 + uRef * std::log((z + z0)/z0) / std::log((zRef +z0)/z0);
        });
 
        // Construct a box that is on y-faces
        const Box& ybx = surroundingNodes(bx,1);
 
        // Set the y-velocity
        ParallelFor(ybx, [=] AMREX_GPU_DEVICE(int i, int j, int k) noexcept
        {
            y_vel(i, j, k) = zero;
        });
    }