What is the cause of cross-stream numerical diffusion?(a) One-dimensional nature of the assumed profiles(b) Multi-dimensional nature of the assumed profiles(c) Higher order of accuracy(d) Higher order of interpolationThis question was addressed to me in an internship interview.My question is based upon Convection-Diffusion Problems in section Convection-Diffusion Problems of Computational Fluid Dynamics

What is the cause of cross-stream numerical diffusion?(a) One-dimensio

1.	What is the cause of cross-stream numerical diffusion?(a) One-dimensional nature of the assumed profiles(b) Multi-dimensional nature of the assumed profiles(c) Higher order of accuracy(d) Higher order of interpolationThis question was addressed to me in an internship interview.My question is based upon Convection-Diffusion Problems in section Convection-Diffusion Problems of Computational Fluid Dynamics
Answer» Right option is (a) One-dimensional nature of the ASSUMED profiles The explanation is: One of the types of numerical DIFFUSION errors is the cross-stream numerical diffusion. Cross-stream numerical diffusion is caused by the one-dimensional nature of INTERPOLATION when the GRID is multi-dimensional. This is caused by cross-flow diffusion or false diffusion.

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