Block Format Keyword Defines SPH gauges.


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
node_ID     Fcut shell_ID DIST    


Field Contents SI Unit Example
gauge_ID Gauge identifier

(Integer, maximum 10 digits)

unit_ID Unit Identifier

(Integer, maximum 10 digits)

gauge_title Gauge title

(Character, maximum 100 characters)

node_ID Node identifier


Fcut Cutoff frequency


shell_ID Shell identifier. Only 4-node shells can be used.


DIST Distance between gauge and shell surface
> 0
Gauge in the side pointed by normal of shell surface.
< 0
Gauge in the opposite side of the normal of shell surface.

Default = 0 (Real)

[ m ]


  1. SPH pressure gauges can be defined by:
    • A node using a node identifier (node_ID > 0), or
    • A shell element (shell_ID) and a distance (DIST). In this case node_ID must be equal to 0.
  2. The SPH approximation is used for measuring the pressure (density) at the gauge location:(1)
    π ( x ) = i , p a r t i c l e s P i V i W ( x x i , h i )
    with x i , h i , V , and P i , respectively being the location, diameter, volume, and the pressure of particle i .

    A correction at order 0 applies in the above equation, whatever the correction order which are specified into the SPH properties.

  3. The pressure may be filtered (a 4-pole Butterworth filter is used).
  4. SPH pressure gauges and ALE or FVM gauges (/GAUGE) cannot share the same gauge_ID.