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LOAD_PRESSURE

Loads

*LOAD_PRESSURE
"Optional title"
coid
entype, enid, fid, $sf$, $t_{beg}$, $t_{end}$, csysid, gid${}_{SPH}$

Parameter definition

Variable
Description
coid
Command ID (optional)
entype
Entity type
options: P, PS, G, GS, FS, SPH, ALL
enid
Entity identification number
fid
ID of a CURVE or FUNCTION defining the pressure load
$sf$
Pressure curve scale factor or FUNCTION (fcn)
default: 1
$t_{beg}$
Start time
default: 0
$t_{end}$
End time
default: 1.0e10
csysid
Optional coordinate system ID. If defined, only surfaces visible from its origin are exposed to the pressure load
default: not used
gid${}_{SPH}$
ID of a GEOMETRY enclosing included SPH particles (entype = SPH only)

Description

Definition of pressure boundary condition.

The intrinsic variables Wext (external work) and vnorm (local surface normal velocity) are accessible when defining a pressure load function. For closed surfaces also vol (current volume) and vol0 (initial volume) can be used in the functional expressions.

When applying pressure on an SPH body, a complementing geometry gid$_{SPH}$ can be defined. Only particles enclosed by this geometry a time $t=0$ and currently located on the surface will be exposed to the pressure load. It is to be noted that the subset of particles located on the surface can change over time, all depending the evolution of the deformation process.

Example

Constant pressure

The following commands define a constant pressure load of 1 MPa on the top surface of the part shown in the figure below.

*LOAD_PRESSURE G, 222, 123 *CURVE 123 0.0, 1.0e6 1.0, 1.0e6 *GEOMETRY_SEED_NODE 222 4000
Plate with holes
Plate with holes
Seed node on top surface with id 4000