Functions/GenXdev.Helpers.Physics/Get-TerminalVelocityByMassGravityDensityAndArea.cs
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// ################################################################################
// Part of PowerShell module : GenXdev.Helpers.Physics // Original cmdlet filename : Get-TerminalVelocityByMassGravityDensityAndArea.cs // Original author : René Vaessen / GenXdev // Version : 2.1.2025 // ################################################################################ // Copyright (c) René Vaessen / GenXdev // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // ################################################################################ using System; using System.Management.Automation; namespace GenXdev.Helpers.Physics { /// <summary> /// <para type="synopsis"> /// Calculates terminal velocity. /// </para> /// /// <para type="description"> /// Uses v = sqrt(2 m g / (ρ A C)). /// </para> /// /// <para type="description"> /// PARAMETERS /// </para> /// /// <para type="description"> /// -MassInKilograms <double><br/> /// Mass in kg.<br/> /// - <b>Position</b>: 0<br/> /// </para> /// /// <para type="description"> /// -GravityInMetersPerSecondSquared <double><br/> /// Gravity in m/s². Default 9.81.<br/> /// - <b>Position</b>: 1<br/> /// - <b>Default</b>: 9.81<br/> /// </para> /// /// <para type="description"> /// -DensityInKilogramsPerCubicMeter <double><br/> /// Fluid density in kg/m³.<br/> /// - <b>Position</b>: 2<br/> /// </para> /// /// <para type="description"> /// -AreaInSquareMeters <double><br/> /// Cross-sectional area in m².<br/> /// - <b>Position</b>: 3<br/> /// </para> /// /// <para type="description"> /// -DragCoefficient <double><br/> /// Drag coefficient. Default 0.5.<br/> /// - <b>Position</b>: 4<br/> /// - <b>Default</b>: 0.5<br/> /// </para> /// /// <para type="description"> /// -As <string><br/> /// Output unit for velocity. Default 'm/s'.<br/> /// - <b>Position</b>: 5<br/> /// - <b>Default</b>: "m/s"<br/> /// - <b>Allowed Values</b>: m/s, km/h, mph, ft/s<br/> /// </para> /// /// <example> /// <para>Example 1: Calculate terminal velocity with specific parameters</para> /// <para>This example calculates the terminal velocity for a mass of 80 kg in air with a drag coefficient of 1.0, outputting the result in mph.</para> /// <code> /// Get-TerminalVelocityByMassGravityDensityAndArea -MassInKilograms 80 -DensityInKilogramsPerCubicMeter 1.225 -AreaInSquareMeters 0.7 -DragCoefficient 1.0 -As "mph" /// </code> /// </example> /// /// <example> /// <para>Example 2: Calculate terminal velocity using positional parameters</para> /// <para>This example uses positional parameters to calculate terminal velocity.</para> /// <code> /// Get-TerminalVelocityByMassGravityDensityAndArea 70 1.225 0.8 0.8 /// </code> /// </example> /// </summary> [Cmdlet(VerbsCommon.Get, "TerminalVelocityByMassGravityDensityAndArea")] [OutputType(typeof(double))] public class GetTerminalVelocityByMassGravityDensityAndAreaCommand : PSGenXdevCmdlet { /// <summary> /// Mass in kg /// </summary> [Parameter( Mandatory = true, Position = 0, HelpMessage = "Mass in kg")] public double MassInKilograms { get; set; } /// <summary> /// Gravity in m/s² (default: 9.81) /// </summary> [Parameter( Mandatory = false, Position = 1, HelpMessage = "Gravity in m/s² (default: 9.81)")] public double GravityInMetersPerSecondSquared { get; set; } = 9.81; /// <summary> /// Fluid density in kg/m³ /// </summary> [Parameter( Mandatory = true, Position = 2, HelpMessage = "Fluid density in kg/m³")] public double DensityInKilogramsPerCubicMeter { get; set; } /// <summary> /// Cross-sectional area in m² /// </summary> [Parameter( Mandatory = true, Position = 3, HelpMessage = "Cross-sectional area in m²")] public double AreaInSquareMeters { get; set; } /// <summary> /// Drag coefficient (default: 0.5) /// </summary> [Parameter( Mandatory = false, Position = 4, HelpMessage = "Drag coefficient (default: 0.5)")] public double DragCoefficient { get; set; } = 0.5; /// <summary> /// Output unit for velocity /// </summary> [Parameter( Mandatory = false, Position = 5, HelpMessage = "Output unit for velocity")] [ValidateSet("m/s", "km/h", "mph", "ft/s")] public string As { get; set; } = "m/s"; protected override void BeginProcessing() { } /// <summary> /// Process record - main cmdlet logic /// </summary> protected override void ProcessRecord() { // Calculate terminal velocity using the formula v = sqrt(2 m g / (ρ A C)) double velocity = Math.Sqrt((2 * MassInKilograms * GravityInMetersPerSecondSquared) / (DensityInKilogramsPerCubicMeter * AreaInSquareMeters * DragCoefficient)); // Convert the velocity to the desired unit using GenXdev.Helpers\Convert-PhysicsUnit var scriptBlock = ScriptBlock.Create(@" param($value, $fromUnit, $toUnit) GenXdev.Helpers\Convert-PhysicsUnit -Value $value -FromUnit $fromUnit -ToUnit $toUnit "); var result = scriptBlock.Invoke(velocity, "m/s", As); // Output the result WriteObject(result[0].BaseObject); } protected override void EndProcessing() { } } } |