Modify the Haaland Function

2019 11 2
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更新时间：2019 11 2
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I've been asked to modify the Haaland Function. I'm fairly new to matlab, and would appreciate the help.

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回答（1 个）

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here the solution:
function f=Haaland(releps,Re)
if Re<=2300 %if Re <= 2300
f=64/Re;
else % if Re > 2300
answer=0.25/(log10(releps/3.7+5.74/Re^0.9))^2; %calculate f using Swamee..
f2=@(x) 1/sqrt(x)+2*log10(releps/3.7+2.51/(Re*sqrt(x))); %Funcion ColeBrook
f=fsolve(f2,answer); %solve function
end
end

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