By Roger Peyret, Egon Krause
This booklet collects the lecture notes in regards to the IUTAM tuition on complicated Turbulent circulate Computations held at CISM in Udine September 7–11, 1998. The direction was once meant for scientists, engineers and post-graduate scholars drawn to the appliance of complex numerical ideas for simulating turbulent flows. the subject contains heavily attached major topics: modelling and computation, mesh pionts essential to simulate advanced turbulent flow.
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Additional info for Advanced Turbulent Flow Computations
For l > 1. k-1 :Lbj = 1 j=O and the conditions for k-th order accuracy are B1-1 = A1, l = 2, ... , k. 6), the time-derivative OtU and the spatial term H(u) are required to be separately approximated to the order k. Therefore, we get the consistency conditions A0 = 0, A 1 = 1 and Bo = 1, that is k k k-1 j=O j=O j=O :L aj = o, :L 1 aj = 1 , :L bj = 1 Then, the conditions for k-th order accuracy are A1 = 0, B1-1 = 0, l = 2, ... , k. tk (Ak+1- Bk) o~+ 1 u + 0(6tk+l). 1 gives the values of the coefficients for schemes up to the fourth-order.
90) v(x) = a1 (x- x;) + ao 26 R. 90), x; is the mid-point abscissa defined by x; = (Xi+l/ 2 + X;- 1;2) /2. The coefficient ao is determined by requiring that the mean value ii; of v(x) inC; coincides with il;, that is ·J. 91) E X i+i/2 i~3/2 FIG. 2 The coefficient a 1 is defined as an approximation to the slope of u(x). 93) where "( is a free parameter. :. 4b), the mean values ui+ 1 and il;-1. 97) where ut-1/2 is the value at Xi+1/2 of the reconstruction polynomial in ci+l· The numerical flux Fl;- 1; 2 is defined in a similar way.
20) give a system of 4 equations for 6 coefficients. Therefore, two of them can be chosen according to various criteria : accuracy, low-storage (Williamson ) or TVD (Shu and Osher , Shu , Gottlieb and Shu ). tH(u2) which presents the advantage to necessitate only one evaluation of H at each stage. Such a scheme, however, is not "low-storage" in the sense which will be discussed in next Section. 22) 1 s 1 1 s b; a;,j c] = 24 , b; ai,j aj,k ck = 24 . 23) 56 R. 22) as well as those ensuring fifth-order accuracy are given by Carpenter and Kennedy .