FLUENT Fluent Software Trainin Ncct⊙tLD TRN-99-003 What is Turbulence? Unsteady, aperiodic motion in which all three velocity components fluctuate mixing matter, momentum, and energy Decompose velocity into mean and fluctuating parts U1=U1+l1( l1) U1(0) Similar fluctuations for pressure, temperature, and species concentration values C Fluent Inc. 2/20D2 © Fluent Inc. 2/20/01 Fluent Software Training TRN-99-003 u Unsteady, aperiodic motion in which all three velocity components fluctuate ’ mixing matter, momentum, and energy. u Decompose velocity into mean and fluctuating parts: Ui (t) º Ui + ui (t) u Similar fluctuations for pressure, temperature, and species concentration values. What is Turbulence? Time U i (t) Ui ui (t)