Estimating Scheme Viscosity for Small-Scale Circulation with Implicit Finite-Difference Schemes

The article proposes a formula for calculating scheme viscosity, which manifests itself in calculations using implicit schemes the transfer of matter and momentum. study aims to substantiate structure viscosity mass momentum equation. As result study, solving equation was determined. accuracy checked on test example. It is substantiated that by all possible means, it necessary avoid when problems small-scale circulation within urban areas. manifestation circulation, small pressure drops provide air movement, unacceptable due many times greater effect over natural viscosity.