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Ce script MATLAB permet le calcul du coefficient de friction (Lambda) F selon la corrélation de Colebrook. // A Matlab script to compute the friction coefficient based on Colebrook correlation.
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%Auteur: Nassim BENTARKA | |
%Ecrit le 15/05/2018 | |
%INPUT: | |
%Nombre de Reynolds: R ; et Rugosité relative: K | |
%Le nombre d'itérations | |
%OUTPUT: | |
%Coefficient de friction lambda: F | |
function F=colebrook(R,K) | |
%Test d'erreurs d'entree: | |
if any(R(:)<=0)==1 | |
error('Le nombre de Reynolds doit etre positif (R>2000).'); | |
end | |
if nargin==1 | |
K=0; | |
end | |
if any(K(:)<0)==1 | |
error('La rugosité relative doit etre positive.'); | |
end | |
%Initialisation des variables | |
X1=(log(10).*K.*R)/(2*3.7*2.51); | |
X2=log((log(10).*R)./(2*2.51)); | |
iterations=2; | |
%Premier terme: Z0=X2-1/5 | |
F=X2-0.2; | |
%Evaluation des j-termes | |
for i=1:1:iterations | |
E=(log(X1+F)+F-X2)./(1+X1+F); %Epsilon | |
F=F-(1+X1+F+0.5*E).*E.*(X1+F)./(1+X1+F+E.*(1+E/3)); | |
end | |
%Solution finale | |
F=((log(10)/2)./F).^2; | |
F |
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