zhyang-dev/openfoam
1
0
Fork 0
mirror of https://develop.openfoam.com/Development/openfoam.git synced 2025-11-28 03:28:01 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

ENH: timeControl: adds some more #423.

Browse Source
This commit is contained in:
mattijs
2017-06-26 11:51:14 +01:00
parent a22d9fe760
commit 2dc8038092
1 changed files with 72 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

77
src/OpenFOAM/db/functionObjects/timeControl/timeControlFunctionObject.C
View File

@ -51,9 +51,20 @@ void Foam::functionObjects::timeControl::readControls()
{
timeEnd_ = time_.userTimeToTime(timeEnd_);
}
deltaTCoeff_ = dict_.lookupOrDefault("deltaTCoeff", GREAT);
dict_.readIfPresent("nStepsToStartTimeChange", nStepsToStartTimeChange_);
deltaTCoeff_ = GREAT;
if (dict_.readIfPresent("deltaTCoeff", deltaTCoeff_))
{
nStepsToStartTimeChange_ = labelMax;
}
else
{
nStepsToStartTimeChange_ = 3;
dict_.readIfPresent
(
"nStepsToStartTimeChange",
nStepsToStartTimeChange_
);
}
}
@ -73,7 +84,6 @@ Foam::scalar Foam::functionObjects::timeControl::calcExpansion
)
{
scalar ratio = startRatio;
// This function is used to calculate the 'expansion ratio' or
// 'time step growth factor'. Inputs:
// - ratio: wanted ratio
@ -226,7 +236,6 @@ void Foam::functionObjects::timeControl::calcDeltaTCoeff
// has reached one that is possible. Returns the new expansionratio.
scalar y = timeToNextMultiple/wantedDT;
label requiredSteps = nSteps;
scalar ratioEstimate = deltaTCoeff_;
@ -240,6 +249,7 @@ void Foam::functionObjects::timeControl::calcDeltaTCoeff
if (!rampDirectionUp)
{
ratioEstimate = 1/ratioEstimate;
ratioMax = 1/ratioMax;
requiredSteps *= -1;
}
// Provision for fall-back value if we can't satisfy requirements
@ -253,16 +263,18 @@ void Foam::functionObjects::timeControl::calcDeltaTCoeff
y,
requiredSteps
);
const scalar deltaTLoop = wantedDT/pow(newRatio, requiredSteps-1);
const scalar deltaTLoop =
wantedDT
/ pow(newRatio, mag(requiredSteps)-1);
scalar firstDeltaRatio = deltaTLoop/deltaT0_;
if (debug)
{
// Avoid division by zero for ratio = 1.0
scalar Sn =
deltaTLoop
*(pow(newRatio, requiredSteps)-1)
*(pow(newRatio, mag(requiredSteps))-1)
/(newRatio-1+SMALL);
if (debug)
{
Info<< " nSteps " << requiredSteps
<< " ratioEstimate " << ratioEstimate
<< " a0 " << deltaTLoop
@ -281,7 +293,7 @@ void Foam::functionObjects::timeControl::calcDeltaTCoeff
)
{
y += 1;
requiredSteps = nSteps;
requiredSteps = mag(nSteps);
if (debug)
{
Info<< "firstDeltaRatio " << firstDeltaRatio << " rampDir"
@ -291,7 +303,7 @@ void Foam::functionObjects::timeControl::calcDeltaTCoeff
continue;
}
if (firstDeltaRatio > ratioMax)
if (firstDeltaRatio > ratioMax && rampDirectionUp)
{
requiredSteps++;
if (debug)
@ -302,7 +314,22 @@ void Foam::functionObjects::timeControl::calcDeltaTCoeff
<< endl;
}
}
else if (newRatio > ratioMax)
else if (firstDeltaRatio < ratioMax && !rampDirectionUp)
{
requiredSteps--;
if (debug)
{
Info<< "First ratio " << firstDeltaRatio
<< " exceeds threshold " << ratioMax << nl
<< "Decreasing required steps " << requiredSteps
<< endl;
}
}
else if
(
(newRatio > ratioMax && rampDirectionUp)
|| (newRatio < ratioMax && !rampDirectionUp)
)
{
y += 1;
requiredSteps = nSteps;
@ -319,8 +346,19 @@ void Foam::functionObjects::timeControl::calcDeltaTCoeff
// Reset future series expansion at last step
if (requiredSteps == 1)
{
Sn = deltaT0_*firstDeltaRatio;
seriesDTCoeff_ = GREAT;
}
// Situations where we achieve wantedDT but fail to achieve
// multiple of writeInterval
scalar jumpError =
remainder(Sn + presentTime, wantedDT) / wantedDT;
if (mag(jumpError) > ROOTSMALL)
{
requiredSteps = label(timeToNextWrite/wantedDT);
firstDeltaRatio = timeToNextWrite/requiredSteps/deltaT0_;
}
if (debug)
{
Info<< "All conditions satisfied deltaT0_:" << deltaT0_
@ -365,10 +403,7 @@ Foam::functionObjects::timeControl::timeControl
dict_(dict),
timeStart_(-VGREAT),
timeEnd_(VGREAT),
nStepsToStartTimeChange_
(
dict.lookupOrDefault("nStepsToStartTimeChange", 3)
),
nStepsToStartTimeChange_(labelMax),
executeControl_(t, dict, "execute"),
writeControl_(t, dict, "write"),
foPtr_(functionObject::New(name, t, dict_)),
@ -494,7 +529,14 @@ bool Foam::functionObjects::timeControl::adjustTimeStep()
scalar nSteps = timeToNextWrite/deltaT;
// For tiny deltaT the label can overflow!
if (nSteps < labelMax)
if
(
nSteps < labelMax
&& (
deltaTCoeff_ != GREAT
|| nSteps < nStepsToStartTimeChange_
)
)
{
// nSteps can be < 1 so make sure at least 1
@ -517,6 +559,7 @@ bool Foam::functionObjects::timeControl::adjustTimeStep()
clipThreshold = 1/clipThreshold;
deltaT = max(newDeltaT, clipThreshold*deltaT);
}
const_cast<Time&>(time_).setDeltaT(deltaT, false);
}
}