fastwater.general.physics module

Functions to calculate various physical parameters used in fluid modelling.

fastwater.general.physics.chezy(C100)[source]

Calculate the Chezy friction coefficient from the C_100 drag coeficient.

Parameters

C100 (float) – C_100 drag coefficient (based on the velocity 100cm above bed).

Returns

Cz – Chezy friction coefficient.

Return type

float

fastwater.general.physics.circulation2D(x, y, vel_x, vel_y)[source]

Calculate the circulation around an element define by the nodes at locations ( x , y ).

Parameters

  • x (list[ float ]) – x coordinates of element nodes [ m ].

  • y (list[ float ]) – y coordinate of element nodes [ m ].

  • vel_x (list[ float ]) – x component of velocity at element nodes [ m/s ].

  • vel_y (list[ float ]) – y component of velocity at element nodes [ m/s ].

Returns

circ – fluid circulation around element.

Return type

float

fastwater.general.physics.frictionCoeff(C100)[source]
fastwater.general.physics.g_wgs84(lat)[source]

Calculate gravity based on latitude on the WGS84 spheroid.

Parameters

lat (float) – Latitude in decimal degrees.

Returns

g – Gravitational acceleration at latitude in m/s^2.

Return type

float

fastwater.general.physics.kinetic_energy_density_2D(mesh, depth, velx, vely, rho)[source]
fastwater.general.physics.manning(C100, h)[source]

Calculate the Manning friction coefficient based on the C_100 drag coefficient and the water depth.

Parameters

  • C100 (float) – Drag coeffieient at 100cm above the beed.

  • h (float) – water depth [ m ].

Returns

m – Manning friction coefficient.

Return type

float

fastwater.general.physics.nikuradse(C100, h)[source]

Calculate the Nikuradse friction coefficient based on the C_100 drag coeffieient and the water depth.

Parameters

  • C100 (float) – Drag coeffieient at 100cm above the beed.

  • h (float) – water depth [ m ].

Returns

ks – Nikuradse friction coefficient.

Return type

float

fastwater.general.physics.potential_energy_density_2D(mesh, elev, rho)[source]
fastwater.general.physics.strickler(C100, h)[source]

Calculate the Strickler friction coefficient based on the C_100 drag coefficient and the water depth.

Parameters

  • C100 (float) – Drag coeffieient at 100cm above the beed.

  • h (float) – water depth [ m ].

Returns

S – Strickler friction coefficient.

Return type

float