SPH_WATER_TUNNEL
Particle
Beta command
This command is in the beta stage and the format may change over time.
*SPH_WATER_TUNNEL
"Optional title"
sid
$v_x$
"Optional title"
sid
$v_x$
Parameter definition
Variable
Description
sid
SPH subdomain ID
$v_x$
Constant flow velocity or ID of a CURVE defining $v_x(t)$
Description
This command is used to convert the SPH domain into a virtual flume tank. The flow inlet is at $x_0$ and the outlet is at $x_1$ (see parameters in PARTICLE_DOMAIN).
Example
Fixed pole in water stream
A rigid pole is submerged in a flume tank. The velocity gradually ramps up from $0.2$ to $2 m/s$.
*UNIT_SYSTEM
SI
*PARAMETER
v0 = 2, "Flow velocity"
#
# --- TIME ---
#
*TIME
0.5
#
# --- MESH ---
#
*COMPONENT_CYLINDER
"Pole"
1, 1, 10, 4
0.4, 0, 0, 0.4, 0, 0.4, 0.05
#
# --- MATERIAL ---
#
*MAT_FLUID
"Water"
1, 1000.0, 2.25e9
*MAT_RIGID
"Steel"
2, 7800.0
#
# --- PART ---
#
*PART
"Pole"
1, 2
#
# --- BC ---
#
*BC_MOTION
"Pole"
1
P, 1, XYZ, XYZ
#
# --- SPH ---
#
*PARTICLE_DOMAIN
ALL, 0, 1000000, 0, 1.0e10
0, -0.4, 0, 1.2, 0.4, 1
0, 1, 1, 0, 1, 1
0, 1, 1
*PARTICLE_SPH
"Water"
1
1, 1
*GEOMETRY_BOX
1
0, -0.4, 0, 1.2, 0.4, 0.2
*SPH_WATER_TUNNEL
"Test"
1
fcn(3)
*CURVE
"v_x(t)"
3
0, [0.1*%v0]
0.1, [%v0]
1.0, [%v0]
#
# --- GRAVITY ---
#
*LOAD_GRAVITY
Z, 981
*FUNCTION
981
9.81
#
# --- MERGE ---
#
*MERGE
SPH, 1, P, 1
*END
