SolverSettings Properties |
The SolverSettings type exposes the following members.
Properties| Name | Description | |
|---|---|---|
 | AllowOutletFreeOutflow |
Flag specifying whether to allow free outflow at an outlet,
i.e., that a natural or a critical flow conditions overrides
the water level condition specified in the boundary condition.
Default: true. |
| Alpha |
The velocity distribution coefficient used in the convective acceleration
term of the momentum equation.
Default: 1
Historically: M11 default = 1, MU default = 1.1
|
| BottomSlotType |
Artificial bottom slot. This is a small void introduced at the base of the section
allowing a volume of water to remain in the section. Hereby instabilities
at low flow are prevented. The slot is inserted at Delh above the river
bottom and extends to 5*Delh below this level.
Default value is Classic |
| Delh |
The Delh factor controls several things:
Default: 0.1 Unit: [m] |
| DelhRelative |
Relative version of Delh. For closed cross section
the value of delh is the smallest of Delh and
DelhRelative * cross section height.
Default value: 0.01 |
| DiffusiveWaveEpsilon |
Epsilon value for diffusive wave approximation
|
| ExtensionData |
Holds data from an extended DataContract
|
| FroudeExp |
Parameter 'b' in the enhanced formulation of the suppression term.
Default: -1 (Indicating that the enhanced formulation is off
|
| FroudeMax |
Parameter 'a' in the enhanced formulation of the suppression term.
Default: -1 (Indicating that the enhanced formulation is off
|
| FullyDynamicTheta |
For the M11 Dynamic Wave scheme (not higher order),
set the level of implicitness.
Default is 1.0;
|
| FullyDynamicUseAlternativeConvectionSuppression |
To increase the numerical stability of the algorithm
an alternative method of applying the convective supression may be applied
when using the fully dynamic or higher order fully dynamic wave approximtions.
Default: false
|
| GlobalDelta |
Time centering. Delta = 1 is fully implicit, i.e. x is estimated at n+1
|
| HeadlossCentering |
Head loss centering. For _headlossCentering = 1, the headloss is calculated. For _headlossCentering = 0,
the headloss (actual headloss, ie diff in water level from node to link) from the previous time step is used exclusively.
Defaut value is 0.2
|
| HigherOrderFrictionFullyUpstream |
For the higher order friction formulation it is possible always to use a
fully upstream weighting of the friction term. In certain cases
this is seen to stabilize the solution.
Default: false
|
| MaximumWaterDepthAboveXSFactor |
Maximum factor for relative water level (depth) compared to cross section height for open cross section.
Given as a factor on the height of the cross section. If water depth exceeds
"factor" x "cross section height" Set to 0 to disable. Then the water depth must always stay inside cross section height. To enable, set larger than 1. |
| MaximumWaterLevelAboveGroundInNodes |
Throw an error is water level in nodes reaches this level above ground. Set to -1 to disable
|
| MinWaterDepth | Minimum water depth in a node/gridpoint. After every timestep the water level is corrected to be at least the minimum water depth. For closed cross sections (circular, egg-shaped and o-shaped (MU circular types), rectangular etc.) the minimum water depth is the smallest of this value and MinWaterDepthRelative x cross section height (diameter). If a gridpoint has a cross section with slot, the minimum water depth is also controlled by the slot, which is using Delh and MinWaterDepthFromBottomOfSlot(Double). This must be less than Delh. In M11 type setups this is set negative -1, effectively disabling this parameter and letting the slot functionality fully control the minimum water depth, and allowing water levels in the slot area. |
| MinWaterDepthRelative | Relative version of MinWaterDepth, in case of closed cross sections the actual minimum water depth is the smallest of the MinWaterDepth and MinWaterDepthRelative * cross section height This must be less than DelhRelative. TODO: Validate this |
| NonReturnValveReopenTimeInSeconds |
Time in seconds for non-return valves to fully open after having closed.
|
| NumberOfTimeStepIterations |
The network engine iterates on each time step to solve the equation system with coefficients
dependent on qauntities evaluated betweeen time step n and time step n+1.
NumberOfTimeStepIterations limits the number of iterations that may be performed.
A value of zero means that no iteration takes place, first values at time n+1 is used.
Default: 1
Historically: M11 default 1, MU default 0 (no iteration)
|
| OscillationHChangeLimit |
When oscillation detection is enabled (UseOscillationDamping),
this is the relative change limit for water levels that will enable procedures
for damping the solution.
Default value is 0.01, i.e. a 1% relative change in an oscillatory solution will trigger damping |
| OscillationQChangeLimit |
When oscillation detection is enabled (UseOscillationDamping),
this is the relative change limit for discharges that will enable procedures
for damping the solution.
Default value is 0.01, i.e. a 1% relative change in an oscillatory solution will trigger damping |
| SinkMomentumCorrection |
Sink momentum correction term. When set to 1, a sink will also
remove a similar amount of momentum, and hence remove strange
artifacts around sink locations. Use 0 to disable the term.
Value must be between zero and one. |
| StructureSetWaterLevelsAtTime |
Decides which water level is used to control structures: WaterLevelN, WaterLevelNph, or WaterLevelNp1
|
| TopSlotAngle |
Angle in degrees for artificial top slot, when using Angle.
Angle with vertical, angle out, ie, the angle is positive if the sides angle away from then center and negative if they angle in toward the center. |
| TopSlotType |
Artificial top slot. This is a small void introduced at the top of the section
allowing a volume of water to run into the section. Hereby instabilities
at high flow are prevented, and pressurized flow is handled.
|
| TopSlotTypeForCrossSectionTypes |
Dictionary to infer top slot type from cross section type. Only used if TopSlotType == InferFromCrossSection
|
| UseOscillationDamping |
Flag specifying whether oscillation damping is enabled.
Oscillations is often seen when the solution change is shifting sign from one time step ([n-1]->[n]) to the next time step ([n]->[n+1]), i.e. first decreasing and then increasing. The oscillation damping procedure will look for shifting in sign-change, but only apply actual damping when the two conditions in OscillationHChangeLimit or OscillationQChangeLimit is met. Default is false. |
| UseQZeroMethod |
Flag specifying whether the QZero method is activated.
The QZeroMethod makes sure that the flow goes towards zero
when the river/link is drying out.
Default: true.
|
See Also