48 lines
2.2 KiB
Matlab
48 lines
2.2 KiB
Matlab
function [Transf] = setupSpace(~,Params)
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Transf.Xmax = 0.5*Params.Lx;
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Transf.Ymax = 0.5*Params.Ly;
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Transf.Zmax = 0.5*Params.Lz;
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Nz = Params.Nz;
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Nx = Params.Nx;
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Ny = Params.Ny;
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% Fourier grids
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x = linspace(-0.5*Params.Lx,0.5*Params.Lx-Params.Lx/Params.Nx,Params.Nx);
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Kmax = pi*Params.Nx/Params.Lx;
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kx = linspace(-Kmax,Kmax,Nx+1);
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kx = kx(1:end-1);
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dkx = kx(2)-kx(1);
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kx = fftshift(kx);
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y = linspace(-0.5*Params.Ly,0.5*Params.Ly-Params.Ly/Params.Ny,Params.Ny);
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Kmax = pi*Params.Ny/Params.Ly;
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ky = linspace(-Kmax,Kmax,Ny+1);
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ky = ky(1:end-1);
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dky = ky(2)-ky(1);
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ky = fftshift(ky);
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z = linspace(-0.5*Params.Lz,0.5*Params.Lz-Params.Lz/Params.Nz,Params.Nz);
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Kmax = pi*Params.Nz/Params.Lz;
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kz = linspace(-Kmax,Kmax,Nz+1);
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kz = kz(1:end-1);
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dkz = kz(2)-kz(1);
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kz = fftshift(kz);
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[Transf.X,Transf.Y,Transf.Z] = ndgrid(x,y,z);
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[Transf.KX,Transf.KY,Transf.KZ] = ndgrid(kx,ky,kz);
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Transf.x = x;
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Transf.y = y;
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Transf.z = z;
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Transf.kx = kx;
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Transf.ky = ky;
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Transf.kz = kz;
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Transf.dx = x(2)-x(1);
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Transf.dy = y(2)-y(1);
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Transf.dz = z(2)-z(1);
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Transf.dkx = dkx;
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Transf.dky = dky;
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Transf.dkz = dkz;
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end |