# K-ε closure

From AMS Glossary

## *k*–ε closure

A type of one-and-a-half-order turbulence closure that retains forecast equations for mean (first-order statistics) variables such as potential temperature and wind components, and also retains equations for variances (turbulence kinetic energy and temperature variance, symbolized by

*k*) and for molecular dissipation or destruction of variances (symbolized by ε).*Compare*first-order closure, K-theory, second-order closure, nonlocal closure, Reynolds averaging, closure assumptions.