Slayt 1 - RTC, Regional Training Centre - Turkey
Slayt 1 - RTC, Regional Training Centre - Turkey
Slayt 1 - RTC, Regional Training Centre - Turkey
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Courant-Friederichs-Lewy criteria cont.If the time step and grid spacing is known, this criteria can beused to determine the fastest wave the model will be able toresolveExample d = 30 km and t = 90 sec (MM5 model)dt230km90sec 2.236kmsec3600850kmhrNote – smaller than the speed of sound which is 1152 km/hrIf this criteria is not obeyed, small scale waves amplifyrapidly and overwhelm the solution leading tocomputational instability