class FluidSimParameter:
    viscosity = 0.1 / 3.0
    # Pr = 1.0
    Pr = 1.0
    # vc = 1.0
    vc = 0.5

    def __init__(self, height: int):
        self.t1 = 3 * self.viscosity + 0.5
        self.t2 = (2 * self.t1 - 1) / (2 * self.Pr) + 0.5
        self.g = (self.vc ** 2) / height

        self.R = self.Pr * self.g * (height ** 3) / (self.viscosity ** 2)


class MagmaParameter(FluidSimParameter):
    viscosity = 10 ** 19
    Pr = 10 ** 25


class WaterParameter(FluidSimParameter):
    viscosity = 8.9 * 10 ** -4
    Pr = 7.56
    vc = 0.05