Solution dialog box — Ambient Conditions

Option	Analysis/Solution Type	Description
Pressure and Temperature
Altitude	all	Sets the altitude constant or time-varying value.For more information, see Additional magnitude options.
Ambient Pressure	Specifies how the ambient pressure of the fluid is defined.SpecifySets the ambient pressure to an absolute pressure value. You set a constant, time-varying, or altitude-varying value for the ambient pressure in the Absolute Pressure Value box. For more information, see Additional magnitude options.From Altitude - Standard ConditionsAdjusts the ambient sea level pressure for the specified altitude using the ideal gas law.
Fluid Temperature	Sets a constant, time-varying, or altitude-varying value for the ambient fluid temperature.For more information, see Additional magnitude options.
Radiative Environment Temperature	Thermal****Coupled Thermal-Flow	Sets a constant, time-varying, or altitude-varying value for the radiative environment temperature.For more information, see Additional magnitude options.
Humidity, Tracer Fluids, and Mixtures
Humidity	Advanced FlowAdvanced Thermal-FlowAdvanced Thermal-Flow with ESC	Specifies the ambient fluid conditions for humidity.None Indicates that the humidity in the fluid domain is not set.RelativeCalculates the fluid humidity using the relative fluid humidity value that you specify in the Relative Humidity (%) box.SpecificCalculates the fluid humidity from the water vapor to dry air mass ratio that you specify in the Water Vapor to Dry Air Mass Ratio box. For more information, see Additional magnitude options.When you use the parallel flow solver, you can specify Relative Humidity (%) or Water Vapor to Dry Air Mass Ratio as a function of time.
Tracer Fluid	Advanced FlowAdvanced Thermal-FlowAdvanced Thermal-Flow with ESC	Specifies the mass fractions for the tracer fluids for the ambient fluid domain.NoneIndicates that the mass fractions for the tracer fluids for the fluid domain are not set.Specify FractionsSets the mass fractions for the tracer fluids listed in the Tracer Fluid List. Use Create Tracer Fluid List to add Tracer Fluid modeling objects to your analysis. For each selected Tracer Fluid modeling object, you set the mass fractions in the Tracer Fluid Mass Fractions box.As a good practice, enter values from 0 to 1 for each mass fraction. The percentage of the main fluid is calculated as 1–∑Mass Fractions.You can use Cut , Copy , and Paste commands to enter the mass fraction values.
Mixture	Advanced FlowAdvanced Thermal-FlowAdvanced Thermal-Flow with ESC	Specifies the mass fractions for the components of a mixture for the ambient fluid domain.NoneIndicates that there is no mixture entering the fluid domain.Homogeneous Gas MixtureSets the mass fractions for the homogenous mixture components. You set them in the Mixture Mass Fractions box.As a good practice, enter values from 0 to 1 for each mass fraction. If the sum of the mass fractions you enter is greater than 1, the values are normalized.You can use Cut , Copy , and Paste commands to enter the mass fraction values.Immiscible Fluid MixtureSets the area fraction of the tracked fluid in the immiscible mixture entering the fluid enclosure. The area fraction value must be between 0 and 1, and it can vary with time in a transient analysis. If it is not defined, the flow solver assigns a value of 1. You define the value in the Tracked Fluid Area Fraction box.
Gravity
You must define gravity in the following cases:When your 3D flow analysis contains buoyancy.When you define Duct Flow Boundary Conditions simulation objects.When you model free convection using either Free Convection to Environment type of Convection to Environment constraint or a Free Convection Coupling type of Thermal Coupling — Convection simulation object.When you model particle tracking.
Gravitational Acceleration	all	Specifies the value for the gravitational acceleration.
Specify Vector	Lets you specify the gravity vector. The gravity vector references the global coordinate system. The gravity vector is unaffected by any subsequent rotation of the model.
Reverse Direction	Reverses the direction of the gravity vector.

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Understanding ambient conditions

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Solution dialog box —Solution Details

Solution dialog box — Solution Units

Solution dialog box — Initial Conditions

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Solution dialog box —Thermal

Solution dialog box —3D Flow

Solution dialog box —Transient Setup

Solution dialog box — Results Options

Solution dialog box (Mapping) — Mapping Details

Solution dialog box (Mapping) — Optional Output

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Solution dialog box — Ambient Conditions , Simcenter 3D 2021.1 Series

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