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cd ${0%/*} || exit 1 # Run from this directory
# Source tutorial run functions
. $WM_PROJECT_DIR/bin/tools/RunFunctions
# Get the serial/parallel mode
! isTest "$@" && [ -n "$1" ] && mode=$1 || mode=serial
# Set global geometric variables using values in constant/fluid/dynamicMeshDict
SCALE=10
SCALE_INV=$(echo "1.0 / $SCALE" | bc -l)
STROKE0=$(foamDictionary constant/fluid/dynamicMeshDict -writePrecision 12 \
-entry mover/piston/motion/stroke -value)
STROKE=$(echo "$SCALE * $STROKE0" | bc -l)
CONROD_LENGTH0=$(foamDictionary constant/fluid/dynamicMeshDict -writePrecision 12 \
-entry mover/piston/motion/conRodLength -value)
CONROD_LENGTH=$(echo "$SCALE * $CONROD_LENGTH0" | bc -l)
TDC_CLEARANCE=10
# Define mesh generation functions...
createSingleValveBaseMesh()
{
local mesh=$1
local valveLift=-$2
local nGap=$3
local pistonPos=-$4
local nClearance=$5
[ $2 == "0" ] && valveState=valveClosed || valveState=valveOpen
foamDictionary system/blockMeshDict.$valveState -set " \
valveLift=$valveLift, \
nValve=$nGap, \
x0=-5, \
nXLeft=4, \
pistonPos=$pistonPos, \
nPiston=$nClearance"
runApplication -a blockMesh ${mesh:+-mesh} $mesh \
-dict system/blockMeshDict.$valveState
runApplication -a mirrorMesh ${mesh:+-mesh} $mesh \
-dict system/mirrorMeshDict
}
createExhaustValveMesh()
{
local mesh=$1
createSingleValveBaseMesh "$mesh" $2 $3 $4 $5
runApplication -a transformPoints ${mesh:+-mesh} $mesh "translate=(-6 0 0)"
foamDictionary constant/${mesh:+meshes/}$mesh/polyMesh/boundary -rename " \
entry0/valveHead=evHead, \
entry0/valveStem=evStem, \
entry0/liner=nonCouple_ev_cyl, \
entry0/inlet=outlet"
foamDictionary constant/${mesh:+meshes/}$mesh/polyMesh/boundary -set \
"entry0/nonCouple_ev_cyl/type=patch"
foamDictionary constant/${mesh:+meshes/}$mesh/polyMesh/boundary -remove \
-entry entry0/nonCouple_ev_cyl/inGroups
}
createIntakeValveMesh()
{
local mesh=$1
createSingleValveBaseMesh "$mesh" $2 $3 $4 $5
runApplication -a transformPoints ${mesh:+-mesh} $mesh "translate=(6 0 0)"
foamDictionary constant/${mesh:+meshes/}$mesh/polyMesh/boundary -rename " \
entry0/valveHead=ivHead, \
entry0/valveStem=ivStem, \
entry0/liner=nonCouple_iv_cyl"
foamDictionary constant/${mesh:+meshes/}$mesh/polyMesh/boundary -set \
"entry0/nonCouple_iv_cyl/type=patch"
foamDictionary constant/${mesh:+meshes/}$mesh/polyMesh/boundary -remove \
-entry entry0/nonCouple_iv_cyl/inGroups
}
createCylinderMesh()
{
local region=fluid
local mesh=$1
local pistonPos=-$2
local nClearance=$3
foamDictionary system/blockMeshDict.cylinder -set " \
pistonPos=$pistonPos,
nPiston=$nClearance"
runApplication -a blockMesh ${mesh:+-mesh} $mesh -region $region \
-dict system/blockMeshDict.cylinder
}
createLinerMesh()
{
local region=liner
local linerTop=$1
local linerBottom=$2
local linerRadius=$3
local linerThickness=$4
foamDictionary system/blockMeshDict.$region -set " \
linerTop=$linerTop,
linerBottom=$linerBottom,
linerRadius=$linerRadius,
linerThickness=$linerThickness"
runApplication -a blockMesh -region $region \
-dict system/blockMeshDict.$region
runApplication -a transformPoints -region $region \
"Rx=90, scale=($SCALE_INV $SCALE_INV $SCALE_INV)"
}
createCylinderHeadMesh()
{
local region=cylinderHead
runApplication -a blockMesh -region $region \
-dict system/blockMeshDict.$region
runApplication -a transformPoints -region $region \
"Rx=90, scale=($SCALE_INV $SCALE_INV $SCALE_INV)"
}
createValveMeshes()
{
local region=exhaustValve
runApplication -a blockMesh -region $region \
-dict system/blockMeshDict.$region
runApplication -a transformPoints -region $region \
"Rx=90, scale=($SCALE_INV $SCALE_INV $SCALE_INV)"
local region=intakeValve
runApplication -a blockMesh -region $region \
-dict system/blockMeshDict.$region
runApplication -a transformPoints -region $region \
"Rx=90, scale=($SCALE_INV $SCALE_INV $SCALE_INV)"
}
createPistonMesh()
{
local region=piston
local pistonPos=-$1
local pistonOppositePos=-$2
local nPistonBase=$3
foamDictionary system/blockMeshDict.$region -set " \
pPos=$pistonPos,
pPos2=$pistonOppositePos,
pRes=$nPistonBase"
runApplication -a blockMesh -region $region \
-dict system/blockMeshDict.$region
runApplication -a transformPoints -region $region \
"Rx=90, scale=($SCALE_INV $SCALE_INV $SCALE_INV)"
}
pistonPositionFromTDC()
{
local cad=$1
local pi=$(echo "scale=10; 4*a(1)" | bc -l)
local theta=$(echo "$cad*($pi/180)" | bc -l)
# - r: position from the crank center
local term1="$CONROD_LENGTH * $CONROD_LENGTH"
local term2="($STROKE * s($theta) / 2.0) * ($STROKE * s($theta) / 2.0)"
local r=$(echo "$STROKE * c($theta) / 2.0 + sqrt( $term1 - $term2 )" | bc -l)
# - pos: position from tdc
local pos=$(echo "$CONROD_LENGTH + $STROKE / 2.0 - $r" | bc -l)
echo $pos
}
round()
{
printf %.$2f $(echo "scale=$2;(((10^$2)*$1)+0.5)/(10^$2)" | bc)
}
createFluidMesh()
{
local region=fluid
local mesh=$1
local ivLift=$2
local evLift=$3
local pistonPos=$(echo "$(pistonPositionFromTDC ${mesh:-0}) + $TDC_CLEARANCE" | bc -l)
local nCyl0=3
local nV0=3
local oneByDx=3
local nIV=$(( $nV0 + $oneByDx*$(round $ivLift 0) ))
local nEV=$(( $nV0 + $oneByDx*$(round $evLift 0) ))
local nCyl=$(( $nCyl0 + $oneByDx*$(round $pistonPos 0) ))
local nCylIV=$(( $nCyl0 + $oneByDx*$(round "($pistonPos - $ivLift)" 0) ))
local nCylEV=$(( $nCyl0 + $oneByDx*$(round "($pistonPos - $evLift)" 0) ))
# Create the fluid mesh modules
createCylinderMesh "$mesh" $pistonPos $nCyl
createExhaustValveMesh _tmp_exhaust $evLift $nEV $pistonPos $nCylEV
createIntakeValveMesh _tmp_intake $ivLift $nIV $pistonPos $nCylIV
# Combine the fluid mesh modules
runApplication -a mergeMeshes ${mesh:+-mesh} $mesh -region $region \
-addMeshes '(_tmp_exhaust _tmp_intake)'
# Delete temporary valve meshes
rm -rf constant/meshes/_tmp*
# Separate ports to mimic complicated engine assembly
runApplication -a createBaffles ${mesh:+-mesh} $mesh -region $region \
-dict system/createBafflesDict
runApplication -a splitBaffles ${mesh:+-mesh} $mesh -region $region
runApplication -a transformPoints ${mesh:+-mesh} $mesh -region $region \
"Rx=90, scale=($SCALE_INV $SCALE_INV $SCALE_INV)"
# Decompose (if necessary) and construct the non-conformal couplings that
# connect the ports and enable the sliding interfaces and thermally couple
# the fluid and solid regions
case $mode in
serial)
runApplication -a createNonConformalCouples ${mesh:+-mesh} $mesh \
-dict system/createNonConformalCouplesDict
;;
parallel)
[ -z $mesh ] && regions=-allRegions || regions="-region fluid"
runApplication -a decomposePar ${mesh:+-mesh} $mesh $regions -noFields
runParallel -a createNonConformalCouples ${mesh:+-mesh} $mesh \
-dict system/createNonConformalCouplesDict
;;
*)
echo "Error: mode $mode not recognised"
exit 1
;;
esac
}
# Generate the solid meshes
createLinerMesh 0 -30 13 1
createCylinderHeadMesh
nPistonBase=18
pistonThickness=5.0
pistonPos=$(echo "$(pistonPositionFromTDC ${mesh:-0}) + $TDC_CLEARANCE" | bc -l)
pistonOppositePos=$(echo "$pistonPos + $pistonThickness" | bc --mathlib)
createPistonMesh $pistonPos $pistonOppositePos $nPistonBase
createValveMeshes
# Generate the fluid mesh
createFluidMesh "" 0 0
# Generate the fluid meshes. Valve lift values are chosen to align with the
# lift profile values defined in the constant/fluid/dynamicMeshDict.
createFluidMesh 0 0 0
# (EV opens)
createFluidMesh 100 0 0.1
createFluidMesh 120 0 0.5
createFluidMesh 140 0 0.9
createFluidMesh 180 0 1.7
createFluidMesh 200 0 2.1
createFluidMesh 220 0 2.5
createFluidMesh 300 0 1.7
# (IV opens)
createFluidMesh 340 0.1 0.9
createFluidMesh 345 0.2 0.8
createFluidMesh 350 0.3 0.7
createFluidMesh 360 0.5 0.5
createFluidMesh 370 0.7 0.3
# (EV closes)
createFluidMesh 380 0.9 0
createFluidMesh 390 1.1 0
createFluidMesh 410 1.5 0
createFluidMesh 440 2.1 0
createFluidMesh 460 2.5 0
createFluidMesh 520 2.1 0
createFluidMesh 550 1.5 0
createFluidMesh 580 0.9 0
createFluidMesh 600 0.5 0
createFluidMesh 610 0.3 0
# (IV closes)
createFluidMesh 620 0 0
# Create the list of mesh times
ls constant/meshes | sort -n > constant/fluid/meshTimes
#------------------------------------------------------------------------------
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