Differences
This shows you the differences between two versions of the page.
Next revision | Previous revisionLast revisionBoth sides next revision | ||
kb:turbulence [2012/07/30 23:15] – created enviadmin | kb:turbulence [2022/04/04 19:24] – [Turbulence Model in ENVI-met] enviadmin | ||
---|---|---|---|
Line 17: | Line 17: | ||
As the result of the TKE-ε equation Km (via Ke and directly) is used as input data for the next calculation cycle, there is a non-linear feedback loop between the turbulent exchange coefficient and the TKE-ε equation. Once Km begins to be unstable, the TKE-ε equation system will get unstable too, producing even more unstable Km's in the next loop.\\ | As the result of the TKE-ε equation Km (via Ke and directly) is used as input data for the next calculation cycle, there is a non-linear feedback loop between the turbulent exchange coefficient and the TKE-ε equation. Once Km begins to be unstable, the TKE-ε equation system will get unstable too, producing even more unstable Km's in the next loop.\\ | ||
- | To avoid numerical problems, several mechanisms have been introduced in ENVI-met making the turbulence model more reliable: | ||
- | * [[Two-Step Calculation Loops (Initialisation)]] | + | ---- |
- | * [[Intelligent Troubleshooting via Relaxation]] | + | <fs smaller>[[kb:start|← go back to Knowledge Base Index]] \\ |
- | * [[Range Limiting]] | + | **See also:** () |
- | + | </ | |
- | In previous ENVI-met versions, it was suggested to calculate the turbulence field using the " | + | ---- |
- | Today, we do not suggest to use the " | + | |
- | Recent computers are strong enough to use the "[[[TURBULENCE]|Continuous Mode]]" (2)!\\ | + | |
- | **As the old update method was a huge source of error and frustration, | + |