*ENVIRONMENT |
 
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*ENVIRONMENT |
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To specify environmental conditions.
Refer to AeroDyn Overview for further information.
Three lines of data, defining environmental conditions as follows:
AIRDENS=Air Density
KINVISC=Kinematic Viscosity
SPDSOUND=Speed of Sound
PATM=Atmospheric Pressure (MHK turbines only)
PVAP=Vapour Pressure (MHK turbines only)
FLUIDDEPTH=Fluid Depth (MHK turbines only)
Typical values would be Air Density 1.225 kg/m3, Kinematic Viscosity 1.460E-5 m2/s (for air), and Speed of Sound 340.3 m/s (in air).
The last three parameters (Atmospheric Pressure, Vapour Pressure & Fluid Depth) are only used when a Cavitation Check is enabled for MHK turbines. As Flexcom is currently designed to work with wind turbines only, these options are not relevant.
Input: |
Description |
Air Density: |
The air density. A typical value is around 1.225 kg/m3 for air. |
Kinematic Viscosity: |
The kinematic viscosity of the air (used in the Reynolds number calculation). A typical value is around 1.460E-5 m2/s for air. |
Speed of Sound: |
The speed of sound in air (used to calculate the Mach number within the unsteady airfoil aerodynamics calculations). A typical value is around 340.3 m/s. |
Atmospheric Pressure (MHK turbines only): |
The atmospheric pressure above the free surface. This is typically around 101,325 Pa. |
Vapour Pressure (MHK turbines only): |
The vapor pressure of the fluid. For seawater this is typically around 2,000 Pa. |
Fluid Depth (MHK turbines only): |
The distance from the hub center to the free surface. |
(a)The last three parameters (Atmospheric Pressure, Vapour Pressure & Fluid Depth) are only used when a Cavitation Check is enabled for MHK (Marine and Hydrokinetic Technology) turbines. As Flexcom is currently designed to work with wind turbines only, these options are not relevant.