Card 9 - HYDENV Ambient Environment Definition

KODE

KODE is the code HYDENV (or 25)

N1

N1 is the absolute (not gauge) value of the static pressure of the Card 5 AMBIENT elements. N1 also defines the zero gauge pressure and the standard pressure values at which the densities on the MAT Cards are defined. The nominal value for 1 atmosphere in SI units is 101,351 Newtons/m².

T1

T1 is the temperature of the Card 5a AMBIENT elements and the standard temperature at which the fluid densities on MAT Card are defined. The nominal room temperature value in SI units is 20°C.

T2

T2 is the magnitude of the acceleration of gravity, 9.81 m/sec² in SI units.

T3

T3 is the angle in degrees between the model's global Z axis and the gravity vector. Down is considered positive (i.e. if the Z axis points upwards, T3 should be 180).

T4

T4 is the angle in degrees between the X axis and the projection of the gravity vector on the global XY plane.

T5

T5 is optional – it may be the code SAMEMAT, or blank, or 0. If T5 is SAMEMAT, then the buoyancy forces for hydraulic networks are calculated by assuming the material of the AMBIENT element is the same as the material of the hydraulic element, and the buoyancy forces are driven solely by their temperature difference. For this option, it is not necessary to define a Card 5a AMBIENT element.

T6

T6 is optional. If T6 is SAMEMAT, then T6 may take on the format Tn (e.g. T136), where n is the number of a temperature vs time table, defined with a TABTYPE and TABDATA Cards, describing the temperature of the AMBIENT environment. This is used for buoyancy calculations only.

Code example

HYDENV 101351 20 9.81 180 0 SAMEMAT
$ AMBIENT ENVIRONMENT DEFINED IN SI UNITS