Compute the Froude number from flow speed v, characteristic length L and gravitational acceleration g to classify subcritical or supercritical open-channel flow and check similarity in ship and weir model tests.
输入流速 v、特征长度 L、g，求弗劳德数。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Froude number | Fr = v/√(gL) | William Froude, 1868 |
| Open-channel regime | Fr<1 subcritical, Fr>1 supercritical | Chow, Open-Channel Hydraulics |