I_P_DI_DDD2D integrates the continuity equation
dI __ __ __
-- = tau^-1*I - [vx vy]*\/I - \/*\/I + Q
in 2D. I initial 2D concetration/intensity; DI increment; DT
time-step X and Y spatial coordinates, required to be very plaid;
TAU - lifetime, either scalar or the same size as I; D diffusion
coeficient, scalar; VX and VY wind, either scalars or the same
size as I, in which case compressible windfield can be modeled.
Bjorn Gustavsson (2022). CEI (https://www.mathworks.com/matlabcentral/fileexchange/1014-cei), MATLAB Central File Exchange. Retrieved .
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