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My problem is very simple, it is a rectangular channel with a 90° change direction like this : ----------| <---- | -----| ^ | | | | | | | The channel's width is 2 meters. May be somebody know how too calculate the headloss ??? My first idea is to use a headloss coefficient...

Thank you for your reply !!! But how much i have to increase n-value ??? Do you know any relation to estimate de headloss if I know the angle ??

Hello, I need to integrate a head loss created by a 90° direction change in a unsteady flow model. I don't see any solution ... I have think to put a head loss coefficient on a cross section but i can't in unsteady flow. (Headloss = k(v2/2g)) Any body can help me ??