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Reference.org
Numerical diffusion
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<p>Numerical diffusion is a difficulty with <a href="/facts/Computer_simulation/Re6o8vzN">computer simulations</a> of continua (such as <a href="/facts/Fluid/wLnMhBC0">fluids</a>) wherein the simulated medium exhibits a higher <a href="/facts/Eddy_diffusion/BJTz4dUv">diffusivity</a> than the true medium. This phenomenon can be particularly egregious when the system should not be diffusive at all, for example an ideal fluid acquiring some spurious viscosity in a numerical model. </p>