# Michlet basic questions

Discussion in 'Software' started by quequen, Aug 13, 2012.

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### quequenSenior Member

Hi, I'm just starting with Michlet and have some basic questions, hope someone could help:
1- Inclined waterlines of modern sailboats can reach the B/L limit of 1/6, but, as underwater body is asymetric, I wonder if it qualify for Michlet analysis.
2- At some thread Leo notes that appendages must be included into the stations as part of a unique volume. No problem with that, but I wonder if the algorytm take count of them on wave resistance or just on skin-friction resistance (or none of them). As leeway is not contemplated, I assume induced resistance isn't part of the outputs.
3- Rectangular and Sectorial wave domains outputs are slightly different, I wonder how should this be interpreted as. Example attached. Rectangular domain shows little waves at the internal part of the wedge (immersed transom?) that are not evident on the sectorial domain.

Thanks!

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2. Joined: Jan 2002
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### Leo LazauskasSenior Member

1. No, asymmetric bodies cannot be handled. If the asymmetry is small, then
it is valid to use the mean of the two sides.

2. If appendages are included in the volume then skin friction and wave
resistance are calculated for the entire volume. Induced resistance is not
calculated.
3. The speckles inside the "wedge" in the first plot are a graphical artifact. It
is just the way the points are calculated to create the graphic of the
rectangular plot. Short wavelength waves are not displayed well if a coarse grid is used.
Of course, this begs the question as to whether these waves actually
exist, or whether they are damped out by viscosity.

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3. Joined: Jul 2009
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### quequenSenior Member

Thanks Leo!

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