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sixDoFRigidBodyMotion: support acceleration relaxation and damping

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This commit is contained in:
Henry
2013-12-06 15:41:17 +00:00
parent 89053fe3d5
commit 7c54adb178
2 changed files with 15 additions and 6 deletions
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17
src/postProcessing/functionObjects/forces/pointPatchFields/derived/sixDoFRigidBodyMotion/sixDoFRigidBodyMotion.C
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@ -175,6 +175,7 @@ Foam::sixDoFRigidBodyMotion::sixDoFRigidBodyMotion()
momentOfInertia_(diagTensor::one*VSMALL), momentOfInertia_(diagTensor::one*VSMALL),
mass_(VSMALL), mass_(VSMALL),
aRelax_(1.0), aRelax_(1.0),
aDamp_(1.0),
report_(false) report_(false)
{} {}
@ -192,6 +193,7 @@ Foam::sixDoFRigidBodyMotion::sixDoFRigidBodyMotion
const tensor& initialQ, const tensor& initialQ,
const diagTensor& momentOfInertia, const diagTensor& momentOfInertia,
scalar aRelax, scalar aRelax,
scalar aDamp,
bool report bool report
) )
: :
@ -215,6 +217,7 @@ Foam::sixDoFRigidBodyMotion::sixDoFRigidBodyMotion
momentOfInertia_(momentOfInertia), momentOfInertia_(momentOfInertia),
mass_(mass), mass_(mass),
aRelax_(aRelax), aRelax_(aRelax),
aDamp_(aDamp),
report_(report) report_(report)
{} {}
@ -239,6 +242,7 @@ Foam::sixDoFRigidBodyMotion::sixDoFRigidBodyMotion(const dictionary& dict)
momentOfInertia_(dict.lookup("momentOfInertia")), momentOfInertia_(dict.lookup("momentOfInertia")),
mass_(readScalar(dict.lookup("mass"))), mass_(readScalar(dict.lookup("mass"))),
aRelax_(dict.lookupOrDefault<scalar>("accelerationRelaxation", 1.0)), aRelax_(dict.lookupOrDefault<scalar>("accelerationRelaxation", 1.0)),
aDamp_(dict.lookupOrDefault<scalar>("accelerationDamping", 1.0)),
report_(dict.lookupOrDefault<Switch>("report", false)) report_(dict.lookupOrDefault<Switch>("report", false))
{ {
addRestraints(dict); addRestraints(dict);
@ -264,6 +268,7 @@ Foam::sixDoFRigidBodyMotion::sixDoFRigidBodyMotion
momentOfInertia_(sDoFRBM.momentOfInertia_), momentOfInertia_(sDoFRBM.momentOfInertia_),
mass_(sDoFRBM.mass_), mass_(sDoFRBM.mass_),
aRelax_(sDoFRBM.aRelax_), aRelax_(sDoFRBM.aRelax_),
aDamp_(sDoFRBM.aDamp_),
report_(sDoFRBM.report_) report_(sDoFRBM.report_)
{} {}
@ -375,8 +380,8 @@ void Foam::sixDoFRigidBodyMotion::updatePosition
if (Pstream::master()) if (Pstream::master())
{ {
v() = v0() + 0.5*deltaT0*a(); v() = v0() + aDamp_*0.5*deltaT0*a();
pi() = pi0() + 0.5*deltaT0*tau(); pi() = pi0() + aDamp_*0.5*deltaT0*tau();
// Leapfrog move part // Leapfrog move part
centreOfMass() = centreOfMass0() + deltaT*v(); centreOfMass() = centreOfMass0() + deltaT*v();
@ -426,8 +431,8 @@ void Foam::sixDoFRigidBodyMotion::updateAcceleration
applyConstraints(deltaT); applyConstraints(deltaT);
// Correct velocities // Correct velocities
v() += 0.5*deltaT*a(); v() += aDamp_*0.5*deltaT*a();
pi() += 0.5*deltaT*tau(); pi() += aDamp_*0.5*deltaT*tau();
if (report_) if (report_)
{ {
@ -446,8 +451,8 @@ void Foam::sixDoFRigidBodyMotion::updateVelocity(scalar deltaT)
if (Pstream::master()) if (Pstream::master())
{ {
v() += 0.5*deltaT*a(); v() += aDamp_*0.5*deltaT*a();
pi() += 0.5*deltaT*tau(); pi() += aDamp_*0.5*deltaT*tau();
if (report_) if (report_)
{ {

4
src/postProcessing/functionObjects/forces/pointPatchFields/derived/sixDoFRigidBodyMotion/sixDoFRigidBodyMotion.H
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@ -122,6 +122,9 @@ class sixDoFRigidBodyMotion
//- Acceleration relaxation coefficient //- Acceleration relaxation coefficient
scalar aRelax_; scalar aRelax_;
//- Acceleration damping coefficient (for steady-state simulations)
scalar aDamp_;
//- Switch to turn reporting of motion data on and off //- Switch to turn reporting of motion data on and off
Switch report_; Switch report_;
@ -264,6 +267,7 @@ public:
const tensor& initialQ, const tensor& initialQ,
const diagTensor& momentOfInertia, const diagTensor& momentOfInertia,
scalar aRelax = 1.0, scalar aRelax = 1.0,
scalar aDamp = 1.0,
bool report = false bool report = false
); );