Observation of oblique angle effect on wave field (Gallery, Marine Dynamics Research Group)

Comparison of three oblique angle conditions Three photos below describe wave fields around a tanker model ship of which length is 2.97m towed in regular wave of wavelength ship length ratio is 0.2 in which wave comes 30deg port from bow with encounter period 0.69sec. The model ship is towed to this side. Wave generator can be seen in blue color at right bottom corner of each photo. Six-degree of ship periodic motions are not constrained even in these oblique towing conditions by using a wave load measuring system developed by the manoeuvring and control group.

Oblique angle +15deg（Drifting port） Reflected wave can be seen on port side and they travel to far region forming circular waves. Starboard side is relatively calm.

Oblique angle 0deg（No drift） Port side reflected wave is not so significant as that in oblique angle +15deg condition. Reflected wave can be seen in starboard side. Wave field shows in-between characteristics of those in oblique angle +15deg and -15deg conditions.

Oblique angle -15deg（Drifting starboard) No circular wave pattern port side far from the model ship is seen. On the other hand waves reflected on starboard side come to standing out.

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