Block Format Keyword

/GAUGE/SPH - Gauges

Description

Defines SPH gauges.

Field	Contents	SI Unit Example
gauge_ID	Gauge identifier (Integer, maximum 10 digits)
unit_ID	Optional unit identifier (Integer, maximum 10 digits)
gauge_title	Gauge title (Character, maximum 100 characters)
node_ID	Node identifier (Integer)
Fcut	Cutoff frequency (Real)
shell_ID	Shell identifier. Only 4-node shells can be used. (Integer)
DIST	Distance between gauge and shell surface Default = 0 (Real) > 0: gauge in the side pointed by normal of shell surface < 0: gauge in the opposite side of the normal of shell surface

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:

with xi, hi, Vi, and Pi, 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.

/GAUGE/SPH