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# `BoundaryConditions`
Last update: 09.03.2026
## Summary
### Classes
NameDescription[`Acceleration`](Acceleration.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.Acceleration)Defines a Acceleration.[`AcousticAbsorptionElement`](AcousticAbsorptionElement.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticAbsorptionElement)Defines a AcousticAbsorptionElement.[`AcousticAbsorptionSurface`](AcousticAbsorptionSurface.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticAbsorptionSurface)Defines a AcousticAbsorptionSurface.[`AcousticDiffuseSoundField`](AcousticDiffuseSoundField.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticDiffuseSoundField)Defines a AcousticDiffuseSoundField.[`AcousticFarFieldRadationSurface`](AcousticFarFieldRadationSurface.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticFarFieldRadationSurface)Defines a AcousticFarFieldRadationSurface.[`AcousticFreeSurface`](AcousticFreeSurface.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticFreeSurface)Defines a AcousticFreeSurface.[`AcousticImpedanceBoundary`](AcousticImpedanceBoundary.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticImpedanceBoundary)Defines a AcousticImpedanceBoundary.[`AcousticImpedanceSheet`](AcousticImpedanceSheet.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticImpedanceSheet)Defines a AcousticImpedanceSheet.[`AcousticIncidentWaveSource`](AcousticIncidentWaveSource.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticIncidentWaveSource)Defines a AcousticIncidentWaveSource.[`AcousticLowReducedFrequency`](AcousticLowReducedFrequency.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticLowReducedFrequency)Defines a AcousticLowReducedFrequency.[`AcousticMassSource`](AcousticMassSource.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticMassSource)Defines a AcousticMassSource.[`AcousticMassSourceRate`](AcousticMassSourceRate.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticMassSourceRate)Defines a AcousticMassSourceRate.[`AcousticPort`](AcousticPort.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticPort)Defines a AcousticPort.[`AcousticPortInDuct`](AcousticPortInDuct.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticPortInDuct)Defines a AcousticPortInDuct.[`AcousticPressure`](AcousticPressure.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticPressure)Defines a AcousticPressure.[`AcousticRadiationBoundary`](AcousticRadiationBoundary.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticRadiationBoundary)Defines a AcousticRadiationBoundary.[`AcousticRigidWall`](AcousticRigidWall.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticRigidWall)Defines a AcousticRigidWall.[`AcousticStaticPressure`](AcousticStaticPressure.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticStaticPressure)Defines a AcousticStaticPressure.[`AcousticSurfaceAcceleration`](AcousticSurfaceAcceleration.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticSurfaceAcceleration)Defines a AcousticSurfaceAcceleration.[`AcousticSurfaceVelocity`](AcousticSurfaceVelocity.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticSurfaceVelocity)Defines a AcousticSurfaceVelocity.[`AcousticSymmetryPlane`](AcousticSymmetryPlane.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticSymmetryPlane)Defines a AcousticSymmetryPlane.[`AcousticTemperature`](AcousticTemperature.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticTemperature)Defines a AcousticTemperature.[`AcousticThermoViscousBLIBoundary`](AcousticThermoViscousBLIBoundary.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticThermoViscousBLIBoundary)Defines a AcousticThermoViscousBLIBoundary.[`AcousticTransferAdmittanceMatrix`](AcousticTransferAdmittanceMatrix.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.AcousticTransferAdmittanceMatrix)Defines a AcousticTransferAdmittanceMatrix.[`BearingLoad`](BearingLoad.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.BearingLoad)Defines a BearingLoad.[`BodyControl`](BodyControl.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.BodyControl)Defines a BodyControl.[`BoltPretension`](BoltPretension.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.BoltPretension)Defines a BoltPretension.[`CompressionOnlySupport`](CompressionOnlySupport.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.CompressionOnlySupport)Defines a CompressionOnlySupport.[`ConstraintEquation`](ConstraintEquation.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.ConstraintEquation)Defines a ConstraintEquation.[`ContactStepControl`](ContactStepControl.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.ContactStepControl)Defines a ContactStepControl.[`Convection`](Convection.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.Convection)Defines a Convection.[`CoupledPhysicsHeatingObjects`](CoupledPhysicsHeatingObjects.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.CoupledPhysicsHeatingObjects)Defines a CoupledPhysicsHeatingObjects.[`Coupling`](Coupling.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.Coupling)Defines a Coupling.[`Current`](Current.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.Current)Defines a Current.[`CylindricalSupport`](CylindricalSupport.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.CylindricalSupport)Defines a CylindricalSupport.[`DetonationPoint`](DetonationPoint.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.DetonationPoint)Defines a DetonationPoint.[`Displacement`](Displacement.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.Displacement)Defines a Displacement.[`EMTransducer`](EMTransducer.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.EMTransducer)Defines a EMTransducer.[`EarthGravity`](EarthGravity.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.EarthGravity)Defines a EarthGravity.[`ElasticSupport`](ElasticSupport.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.ElasticSupport)Defines a ElasticSupport.[`ElectricCharge`](ElectricCharge.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.ElectricCharge)Defines a ElectricCharge.[`ElementBirthAndDeath`](ElementBirthAndDeath.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.ElementBirthAndDeath)Defines a ElementBirthAndDeath.[`ElementControls`](ElementControls.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.ElementControls)Defines a ElementControls.[`FixedRotation`](FixedRotation.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.FixedRotation)Defines a FixedRotation.[`FixedSupport`](FixedSupport.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.FixedSupport)Defines a FixedSupport.[`FluidPenetrationPressure`](FluidPenetrationPressure.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.FluidPenetrationPressure)A class for fluid penetration pressure object in Mechanical. This load object is used to simulate surrounding fluid or air penetrating into the contact interface.[`FluidSolidInterface`](FluidSolidInterface.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.FluidSolidInterface)Defines a FluidSolidInterface.[`Force`](Force.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.Force)Defines a Force.[`FrictionlessSupport`](FrictionlessSupport.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.FrictionlessSupport)Defines a FrictionlessSupport.[`GeneralizedPlaneStrain`](GeneralizedPlaneStrain.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.GeneralizedPlaneStrain)Defines a GeneralizedPlaneStrain.[`GenericBoundaryCondition`](GenericBoundaryCondition.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.GenericBoundaryCondition)Defines a GenericBoundaryCondition.[`GeometryBasedAdaptivity`](GeometryBasedAdaptivity.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.GeometryBasedAdaptivity)Defines a GeometryBasedAdaptivity.[`HeatFlow`](HeatFlow.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.HeatFlow)Defines a HeatFlow.[`HeatFlux`](HeatFlux.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.HeatFlux)Defines a HeatFlux.[`HydrostaticPressure`](HydrostaticPressure.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.HydrostaticPressure)Defines a HydrostaticPressure.[`ImpedanceBoundary`](ImpedanceBoundary.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.ImpedanceBoundary)Defines a ImpedanceBoundary.[`ImportedCFDPressure`](ImportedCFDPressure.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.ImportedCFDPressure)Defines a ImportedCFDPressure.[`InternalHeatGeneration`](InternalHeatGeneration.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.InternalHeatGeneration)Defines a InternalHeatGeneration.[`JointLoad`](JointLoad.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.JointLoad)Defines a JointLoad.[`LegacyThermalCondition`](LegacyThermalCondition.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.LegacyThermalCondition)Defines a LegacyThermalCondition.[`LimitBoundary`](LimitBoundary.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.LimitBoundary)Defines a LimitBoundary.[`LinePressure`](LinePressure.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.LinePressure)Defines a LinePressure.[`LoadApplication`](LoadApplication.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.LoadApplication)Defines a LoadApplication.[`LoadGroup`](LoadGroup.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.LoadGroup)Defines a LoadGroup.[`MagneticFluxParallel`](MagneticFluxParallel.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.MagneticFluxParallel)Defines a MagneticFluxParallel.[`MassFlowRate`](MassFlowRate.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.MassFlowRate)Defines a MassFlowRate.[`Moment`](Moment.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.Moment)Defines a Moment.[`NodalDisplacement`](NodalDisplacement.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.NodalDisplacement)Defines a NodalDisplacement.[`NodalForce`](NodalForce.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.NodalForce)Defines a NodalDisplacement.[`NodalOrientation`](NodalOrientation.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.NodalOrientation)Defines a NodalOrientation.[`NodalPressure`](NodalPressure.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.NodalPressure)Defines a NodalPressure.[`NodalRotation`](NodalRotation.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.NodalRotation)Defines a NodalRotation.[`NonlinearAdaptiveRegion`](NonlinearAdaptiveRegion.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.NonlinearAdaptiveRegion)Defines a NonlinearAdaptiveRegion.[`PSDAcceleration`](PSDAcceleration.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.PSDAcceleration)Defines a PSDAcceleration.[`PSDDisplacement`](PSDDisplacement.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.PSDDisplacement)Defines a PSDDisplacement.[`PSDGAcceleration`](PSDGAcceleration.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.PSDGAcceleration)Defines a PSDGAcceleration.[`PSDLoad`](PSDLoad.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.PSDLoad)Defines a PSDLoad.[`PSDPressure`](PSDPressure.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.PSDPressure)Defines a PSDPressure.[`PSDVelocity`](PSDVelocity.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.PSDVelocity)Defines a PSDVelocity.[`PerfectlyInsulated`](PerfectlyInsulated.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.PerfectlyInsulated)Defines a PerfectlyInsulated.[`PipePressure`](PipePressure.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.PipePressure)Defines a PipePressure.[`PipeTemperature`](PipeTemperature.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.PipeTemperature)Defines a PipeTemperature.[`PlasticHeating`](PlasticHeating.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.PlasticHeating)Defines a PlasticHeating.[`Pressure`](Pressure.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.Pressure)Defines a Pressure.[`RSAcceleration`](RSAcceleration.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.RSAcceleration)Defines a RSAcceleration.[`RSDisplacement`](RSDisplacement.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.RSDisplacement)Defines a RSDisplacement.[`RSLoad`](RSLoad.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.RSLoad)Defines a RSLoad.[`RSVelocity`](RSVelocity.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.RSVelocity)Defines a RSVelocity.[`Radiation`](Radiation.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.Radiation)Defines a Radiation.[`RemoteDisplacement`](RemoteDisplacement.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.RemoteDisplacement)Defines a RemoteDisplacement.[`RemoteForce`](RemoteForce.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.RemoteForce)Defines a RemoteForce.[`RotatingForce`](RotatingForce.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.RotatingForce)Defines a RotatingForce.[`RotationBoundaryCondition`](RotationBoundaryCondition.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.RotationBoundaryCondition)Defines a RotationBoundaryCondition.[`RotationalAcceleration`](RotationalAcceleration.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.RotationalAcceleration)Defines a RotationalAcceleration.[`RotationalVelocity`](RotationalVelocity.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.RotationalVelocity)Defines a RotationalVelocity.[`SimplySupported`](SimplySupported.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.SimplySupported)Defines a SimplySupported.[`SurfaceChargeDensity`](SurfaceChargeDensity.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.SurfaceChargeDensity)Defines a SurfaceChargeDensity.[`Temperature`](Temperature.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.Temperature)[`ThermalCondition`](ThermalCondition.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.ThermalCondition)[`Velocity`](Velocity.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.Velocity)Defines a Velocity.[`ViscoelasticHeating`](ViscoelasticHeating.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.ViscoelasticHeating)Defines a ViscoelasticHeating.[`Voltage`](Voltage.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.Voltage)Defines a Voltage.[`VoltageGround`](VoltageGround.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.VoltageGround)Defines a VoltageGround.[`VolumeChargeDensity`](VolumeChargeDensity.md#ansys.mechanical.stubs.v252.Ansys.ACT.Automation.Mechanical.BoundaryConditions.VolumeChargeDensity)Defines a VolumeChargeDensity.
## Description
BoundaryConditions module.