AbstractHeadLossStructure Class

Abstract class for head loss structures.

Definition

Namespace: DHI.Mike1D.StructureModule
Assembly: DHI.Mike1D.StructureModule (in DHI.Mike1D.StructureModule.dll) Version: 24.0.0.0 (11.1.1.1111)
C#
public abstract class AbstractHeadLossStructure : Structure, 
	ISolvesHeadLossEquation, ISolvesEnergyEquation
Inheritance
Object    Structure    AbstractHeadLossStructure
Derived
Implements
ISolvesEnergyEquation, ISolvesHeadLossEquation

Constructors

AbstractHeadLossStructureInitializes a new instance of the AbstractHeadLossStructure class

Properties

ConvectionTermReductionCoefficient Reduction coefficient for convection terms (kinetic energy terms) in energy equation. This coefficient is applied when the difference between inflow kinetic energy and outflow kinetic energy (or more precisely, velocity head difference measured in meters) becomes larger than the total head loss. 0 corresponds to no reduction (default) whereas 1 corresponds to removing the upstream and downstream convective terms.
CriticalFlow Flag indicating of flow is critical through the structure, and the head loss/energy loss equation is not active.
CriticalFlowConditions Critical flow conditions depending on flow direction.
CriticalFlowConditionsCalculation Flag specifying that calculations are performed when generating critical flow condition tables.
CriticalFlowConditionsNegative Critical flow conditions for negative flow.
CriticalFlowConditionsPositive Critical flow conditions for positive flow.
dDischargedDownStreamWaterLevel Calculated Discharge derivative with DownStreamWaterLevel. Downstream is relative to the direction of chainage. The value is calculated by SetWaterLevels. Unit: [m^2/s]
(Inherited from Structure)
dDischargedUpStreamWaterLevel Calculated Discharge derivative with UpStreamWaterLevel. Upstream is relative to the direction of chainage. The value is calculated by SetWaterLevels. Unit: [m^2/s]
(Inherited from Structure)
dHeadLossDischarge Head loss derivative with respect to discharge
Discharge Calculated Discharge. The value is calculated by SetWaterLevels. Unit: [m^3/s]
(Inherited from Structure)
DischargeCriticalForTableCalculation Critical discharge when performing table calculations.
DischargeEnergyEquation Discharge calculated after solving energy equation
DownstreamCrossSection Downstream cross section data. The cross section data is the processed level, with, area.
DownstreamExternalEnergyLevel Flag indicating to use downstream external energy level.

For false the downstream energy level is calculated as part of the internal solution. It is more stable to set DownstreamExternalEnergyLevel to true.

DownstreamWaterLevel Downstream water level.Downstream refers to the direction of chainage. The water level is set by use of SetWaterLevels Unit: [m]
(Inherited from Structure)
EnableCheckFlowDirectionOscillations Flag indicating whether to use special check and damping for structure discharge oscillating around zero.
(Inherited from Structure)
ExtensionData Property used by (de)serializer, when it can not find proper target for a data field. Support of forward compatible data contracts.
(Inherited from Structure)
FlowArea Flow area through structure. Used by most (but not all) structures.
(Inherited from Structure)
FlowFactor The discharge (and discharge derivatives) are scaled by the flow factor.
(Inherited from Structure)
GenerateCriticalFlowConditions Flag specifying to generate critical flow condition tables when the whole composite structure is taken into account.
HeadLoss Calculated Head loss for the current flow conditions. Unit: [m]
HeadLossCoefficient Calculated Head loss coefficient for the current flow conditions. Unit: [1/m^4]
HeadLossMode Flag indicating whether to use head loss calculations.
ID Structure ID
(Inherited from Structure)
IDInUserUnit Used to get a consistent description of the structure. The ID comes in user units. Used e.g. when reporting errors, warnings and hints.
(Inherited from Structure)
Implicit Flag to control if the structure is implicit or explicit. If the structure is explicit (Implicit == false) then the derivatives of the dicharge are always zero. Default value: true
(Inherited from Structure)
InvertLevelDownstream Invert level down stream
(Inherited from Structure)
InvertLevelUpstream Invert level up stream
(Inherited from Structure)
IsCriticalForTableCalculation Flag specifying that structure is critical when performing composite structure critical flow conditions calculations.
Length Length of the structure. Unit: [m] Default value: 0m
(Inherited from Structure)
Location Location property.
(Inherited from Structure)
ModifyWaterLevels Flag specifying to modify water levels by friction loss.
PartOfCompositeFlow Part of the flow in a parallel structure that passes through this structure.
PartOfCompositeFlowMinimal Limit for part of composite flow below which it is assumed that structure has no flow.
Residual Residual after solving the energy equation.

Relevant only for Levenberg-Marquardt type of solvers.

RunTimeDiagnostics The getter is used to get a list of errors.
(Inherited from Structure)
SideStructureBank Bank side that side-structure is located on

If side structure contains reservoir, and has the Coordinate set, this is not used (and should be set to Undefined).


(Inherited from Structure)
SideStructureReservoir Reservoir at end of side structure. Null if not side structure, or no reservoir is defined
(Inherited from Structure)
SkipInitialGuess Flag specifying to skip initial guess in the energy equation solver.
SkipPartOfCompositeFlow Flag specifying to use part of composite flow equal to one for all structures in the composite structure.
SmoothingFactor Exponential smoothing factor for structure discharge. The smoothing factor is the weight of the previous discharge on the new discharge: q = (1 - SmoothingFactor) * qStructure + SmoothingFactor * qPrevious
(Inherited from Structure)
SolverMethod Solution method for solving the energy equations.
StationaryStateCalculation Flag specifying that stationary state calculations are performed.
StructureType Type of structure
(Inherited from Structure)
TopoID String used to identified cross sections
(Inherited from Structure)
Type Structure type, unique for each type structure.
(Inherited from Structure)
UpstreamCrossSection Upstream cross section data. The cross section data is the processed level, with, area.
UpstreamExternalEnergyLevel Flag indicating to use upstream external energy level.

For false the upstream energy level is calculated as part of the internal solution. It is more stable to set UpstreamExternalEnergyLevel to true.

UpstreamWaterLevel Upstream water level. Upstream refers to the direction of chainage. The water level is set by use of SetWaterLevels Unit: [m]
(Inherited from Structure)
UseFrictionFromHD Use friction in energy equation from HD module.
WaterLevelDifferenceMinimal Water level difference below which it is assumed that structure has no flow.
(Inherited from Structure)
ZeroFlow Flag indicating no flow through structure (upstream water level below invert level).

Methods

Accepts List of data types that is accepted, i.e., that you can get a ValueSetter for.
(Inherited from Structure)
AddToOffers Add additional offers to structure
(Inherited from Structure)
ApplyFlowFactor Applies flow factor to discharge and it's derivatives
(Inherited from Structure)
ControlSetFlowFactor Set flow factor to specified value
(Inherited from Structure)
Description Return a string that describes this structure. Includes structure type and ID
(Inherited from Structure)
DetermineCriticalPartOfCompositeFlow Determines part of composite flow for structure, which was marked as having critical flow with initial estimate of part of composite flow.
Dispose Frees the licenses held.
(Inherited from Structure)
EqualsDetermines whether the specified object is equal to the current object.
(Inherited from Object)
Evaluate(StructureParametersFromHD) Sets up- and down-stream water level and discharge and calculates the headloss and its derivatives.
Evaluate(Double, Double, Double) Sets up- and down-stream water level and discharge and calculates the headloss and its derivatives.
ExplicitStructureSupport DEBUG: This method is called from Validate() if _implitcit == false to check if the structure supports being Explicit. Once all structures support explicit operation this method can be deleted.
(Inherited from Structure)
FinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.
(Inherited from Object)
GetActionInfos List of control action infos
(Inherited from Structure)
GetControlAction Get control action for the specified id. It always returns one of the ActionControl delegates. It will return null if controlActionId is not valid.

Base implementation for IControllable


(Inherited from Structure)
GetCurrentValue Get the current value of the control for the specified id.

Base implementation for IControllable


(Inherited from Structure)
GetHashCodeServes as the default hash function.
(Inherited from Object)
GetPartOfCompositeFlowEstimateFactor Provides an estimate factor for part of composite flow. Presently it is upstream structure cross-section to upstream cross-section flow area ratio.
GetTypeGets the Type of the current instance.
(Inherited from Object)
Initialize(IDiagnostics) Set up structure and set runtime diagnostics object
(Inherited from Structure)
Initialize(ICrossSection, ICrossSection, Boolean, IDiagnostics) Set up structure and set runtime diagnostics object
(Inherited from Structure)
MemberwiseCloneCreates a shallow copy of the current Object.
(Inherited from Object)
Offers A list of quantities available from this structure
(Inherited from Structure)
Prepare(HDParameterData, IDiagnostics) Set up structure and set runtime diagnostics object
(Inherited from Structure)
Prepare(DateTime, HDParameterData, IDiagnostics) Set up structure and set runtime diagnostics object
(Inherited from Structure)
ResetControlledState Reset internal state (if any) used by controlling class. Called after a controlling class has performed a control sequence, and simulation is restarted.

Base implementation for IControllable


(Inherited from Structure)
SetControlStrategyId Set control strategy ID manually.

Base implementation for IControllable


(Inherited from Structure)
SetInputWaterLevels Set the _upstreamWaterLevel, _downstreamWaterLevel and _flowDir
(Inherited from Structure)
SetWaterLevels(StructureParametersFromHD) Sets up- and down-stream water level and forces the calculation of the discharge and its derivatives.
SetWaterLevels(Double, Double) Sets up- and down- stream water level and forces the calculation of the discharge and its derivatives.

Override in extending classes to do something useful.


(Overrides StructureSetWaterLevels(Double, Double))
SetWaterLevels(Double, Double, Double, Double) Sets up- and down-stream water level and forces the calculation of the discharge and its derivatives.
SetZeroFlow Sets the conditions for zero flow
(Overrides StructureSetZeroFlow)
ToStringReturns a string that represents the current object.
(Inherited from Object)
UpdatedWaterLevels After a time step (or iteration) has finished, update the discharge to the actual value, based on the final water levels and the discharge derivatives.
(Inherited from Structure)
Validate Writes errors, warnings and hints into their respective member classes. The member objects are initially cleared.
(Inherited from Structure)
ValueGetter Get value setter for the specified data quantity
(Inherited from Structure)
ValueSetter Get value setter for the specified data type
(Inherited from Structure)

Fields

_accepts List of quantities that are accepted
(Inherited from Structure)
_controlStategyId If the structure is being controlled, then _controlStategyId contains the ID of the active control strategy
(Inherited from Structure)
_crossSection1 Help variable for the upstream cross section relative to the actual flow.
_crossSection2 Help variable for the downstream cross section relative to the actual flow.
_downstreamCrossSection Downstream cross section data. The cross section data is the processed level, with, area.
_downstreamWaterLevel Downstream water level, as set by SetWaterLevels(Double, Double) Unit: [m]
(Inherited from Structure)
_dqdhDownstream The derivative of flow through the structure with downstream water level. The flow is calculated in the derived classes when the SetWaterLevels method is called. Unit: [m2/sec]
(Inherited from Structure)
_dqdhUpstream The derivative of flow through the structure with upstream water level. The flow is calculated in the derived classes when the SetWaterLevels method is called. Unit: [m2/sec]
(Inherited from Structure)
_flowArea Flow area through structure. Used by most (but not all) structures.
(Inherited from Structure)
_flowDir FlowDir is used to determine which parameters to use for the flow calculations. Derived by the SetWaterLevels(Double, Double).
(Inherited from Structure)
_flowRegime Flow regime for discharge mode.
_flowRegimeHeadLoss Flow regime for head loss mode.
_h1 Water level at cross section upstream (relative to actual flow direction)
_h2 Water level at cross section downstream (relative to actual flow direction)
_id Identification name of the structure
(Inherited from Structure)
_implicit If _implicit == false, then the derivatives are always zero. Default value: true.
(Inherited from Structure)
_location Location in the network
(Inherited from Structure)
_offers List of quantities that are offered
(Inherited from Structure)
_parameters A class which contains parameters passed from HD module to Structure module during the run of the simulation.
_partOfCompositeFlow Part of the flow in a parallel structure that passes through this structure.
_q Flow through the structure. The flow is calculated in the derived classes when the SetWaterLevels method is called. Unit: [m3/sec]
(Inherited from Structure)
_qEnergyEquation Discharge calculated after solving energy equation
_qSaintVenant Discharge leading to a head loss (used when HeadLossMode=true)
_qSaintVenantFull Discharge leading to a head loss without part of composite flow (used when HeadLossMode=true)
_runTimeDiagnostics Diagnostics are written into this Diagnostics during calculations. Set during Initialize(IDiagnostics)
(Inherited from Structure)
_topoID Identification used to find referenced cross sections
(Inherited from Structure)
_upstreamCrossSection Upstream cross section data. The cross section data is the processed level, with, area.
_upstreamWaterLevel Upstream water level, as set by SetWaterLevels(Double, Double) Unit: [m]
(Inherited from Structure)
_v1 Velocity estimate upstream relative to actual flow direction of the structure.
_v2 Velocity estimate at cross section downstream (relative to actual flow direction).
_zeroFlow Flag indicating no flow through structure (upstream water level below invert level).

See Also