Enh/liquid motors tank inertia

rocketpy/Function.py

@@ -2030,30 +2030,3 @@ def differentiate(self, x, dx=1e-6):
         # h = (10)**-300
         # z = x + h*1j
         # return self(z).imag/h
-
-
-def Funcify(*args, **kwargs):
-    """Decorator factory to wrap callables as Function objects.
-    See rocketpy.Function for parameters information.
-
-    Returns
-    -------
-    decorator : function
-        Decorator function to wrap callables as Function objects.
-
-    Examples
-    --------
-    >>> @Funcify(inputs=['x'], outputs=['y'])
-    ... def f(x):
-    ...     return x**2
-    >>> f
-    Function object with inputs ['x'] and outputs ['y'].
-    >>> g = 2*f + 3
-    >>> g(2)
-    11
-    """
-
-    def decorator(func):
-        return Function(func, *args, **kwargs)
-
-    return decorator

rocketpy/motors/Fluid.py

@@ -40,7 +40,7 @@ def __post_init__(self):
 
         if not isinstance(self.name, str):
             raise ValueError("The name must be a string.")
-        if self.density <= 0:
+        if self.density < 0:
             raise ValueError("The density must be a positive number.")
         if self.quality < 0 or self.quality > 1:
             raise ValueError("The quality must be a number between 0 and 1.")