Fluid kinematics sensor
You can view the fluid kinematics at a load by adding a
Fluid kinematics sensor.
This sensor shows the velocity and/or acceleration (i.e. kinematics) of the relevant fluid that is giving loads on the node in question - at the node in question. Thus, this is the kinematics at the node's position at the given point in time, i.e. the position changes dynamically with the node's position.
Fluid loads (in air from wind or in the sea from waves and currents) on nodes are typically lumped loads from one (of possibly more) elements connected to the node. The load is calculated based on the relevant fluid kinematics at the midpoint of the element (and NOT at the node itself). Thus, the fluid kinematics from the sensor will typically have a small discrepancy compared to the fluid kinematics producing the load.
There are three different parameters that can be shown in the sensor. A parameter is shown in the sensor if the node has a load that uses the fluid parameter in question (see table below as
Activating loads).
Fluid kinematics sensors cannot be added for blade nodes
The fluid kinematics shown in this sensor are given in the global coordinate system (see
Coordinate systems)
The
fluid kinematics
sensor provides the following fields. The different fields are only active if an activating load is present. Particle acceleration is only shown if Wave load inertia, Added-mass (perp.) eq. load, Heave plate inertia load, Heave plate added-mass eq. load are present. Particle velocity (sea) is only shown if Hydro drag load, Heave plate drag load are present. Particle velocity (wind) and turbulence are only shown if Aero drag load is present.
| Field | Unit | Description |
| Particle acc. (sea) | m.s-2 | Acceleration of the water particle at the node's current position |
| Particle acc. (sea) - mag. | m.s-2 | Magnitude of the acceleration of the water particle at the node's current position |
| Particle vel. (sea) | m.s-1 | Velocity of the water particle at the node's current position |
| Particle vel. (sea) - mag. | m.s-1 | Magnitude of the velocity of the water particle at the node's current position |
| Particle vel. (sea) - X | m.s-1 | X-component of the velocity of the water particle at the node's current position |
| Particle vel. (sea) - Y | m.s-1 | Y-component of the velocity of the water particle at the node's current position |
| Particle vel. (sea) - Z | m.s-1 | Z-component of the velocity of the water particle at the node's current position |
| Particle vel. (wind) | m.s-1 | Velocity of the air particle at the node's current position |
| Particle vel. (wind) - mag. | m.s-1 | Magnitude of the velocity of the air particle at the node's current position |
| Particle vel. (wind) - X | m.s-1 | X-component of the velocity of the air particle at the node's current position |
| Particle vel. (wind) - Y | m.s-1 | Y-component of the velocity of the air particle at the node's current position |
| Particle vel. (wind) - Z | m.s-1 | Z-component of the velocity of the air particle at the node's current position |
| Particle vel. (wind) @ initial pos | m.s-1 | Velocity of the air particle at the node's initial (undeformed) position |
| Particle vel. (wind) @ initial pos - mag. | m.s-1 | Magnitude of the velocity of the air particle at the node's initial (undeformed) position |
| Particle vel. (wind) @ initial pos - X | m.s-1 | X-component of the velocity of the air particle at the node's initial (undeformed) position |
| Particle vel. (wind) @ initial pos - Y | m.s-1 | Y-component of the velocity of the air particle at the node's initial (undeformed) position |
| Particle vel. (wind) @ initial pos - Z | m.s-1 | Z-component of the velocity of the air particle at the node's initial (undeformed) position |
| Turbulence streamwise | m.s-1 | Streamwise (along-wind) turbulent component of the wind at the node |
| Turbulence streamwise [%] | % | Streamwise turbulent component of the wind at the node, expressed as a percentage of the mean wind speed |
| Turbulence crosswise | m.s-1 | Crosswise (lateral) turbulent component of the wind at the node |
| Turbulence crosswise [%] | % | Crosswise turbulent component of the wind at the node, expressed as a percentage of the mean wind speed |
| Turbulence vertical | m.s-1 | Vertical turbulent component of the wind at the node |
| Turbulence vertical [%] | % | Vertical turbulent component of the wind at the node, expressed as a percentage of the mean wind speed |