…In other words, the turbulent velocity v becomes a random field. When the joint distribution of any finite number of random fields X { X (λ 1 ), X (λ 2 ), …, X (λ h )} is normal, X is called a Gaussian random field. In particular, when Λ= R n , the mean value of X (λ) is 0 and the covariance of X (λ) -X (θ) and X (λ′)- X (θ) is 1/2(|λ-θ|+|λ′-θ|-|λ-λ′|), X is called a Levy n -coefficient Brownian motion. … *Some of the terminology that refers to "Gaussian random field" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…すなわち,乱流の速度vは確率場になる。確率場Xの任意の有限個{X(λ1),X(λ2),……,X(λh)}の同時分布が正規分布であるとき,Xをガウス型確率場と呼ぶ。とくに,Λ=Rn,X(λ)の平均値が0でX(λ)-X(θ)とX(λ′)-X(θ)の共分散が1/2(|λ-θ|+|λ′-θ|-|λ-λ′|)となるとき,Xをレビのn次元係数ブラウン運動という。… ※「ガウス型確率場」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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