PDRAG

PDRAG, PX1, PY1, PZ1, H1, PX2, PY2, PZ2, H2, Kcord
Defines the external fluid drag loading for a piping run.

PREP7:Piping
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PX1, PY1, PZ1

External fluid drag pressure (global Cartesian components) at height H1.

H1

Height (along Kcord coordinate) for first drag pressure.

PX2, PY2, PZ2

External fluid drag pressure (global Cartesian components) at height H2.

H2

Height (along Kcord coordinate) for second drag pressure.

Kcord

Coordinate direction for height value (in the global Cartesian coordinate system):

X  

 — 

X coordinate.

Y  

 — 

Y coordinate (default).

Z  

 — 

Z coordinate.

Notes

Defines the external fluid drag loading (pressure) as a function of height for a piping run. (See the RUN command description in Part II: Archived Commands.) The element drag pressure is determined from the centroid height and linear interpolation. Pressures are assigned to the elements as they are generated.