venuss 0.0.1

Venus celestial simulation crate for the MilkyWay SolarSystem workspace
Documentation 
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use sciforge::hub::domain::common::constants::G;

pub struct Impactor {
    pub diameter_m: f64,
    pub density_kg_m3: f64,
    pub velocity_m_s: f64,
    pub impact_angle_deg: f64,
}

impl Impactor {
    pub fn asteroid(diameter_m: f64, velocity_m_s: f64) -> Self {
        Self {
            diameter_m,
            density_kg_m3: crate::STONY_ASTEROID_DENSITY,
            velocity_m_s,
            impact_angle_deg: 45.0,
        }
    }

    pub fn iron_asteroid(diameter_m: f64, velocity_m_s: f64) -> Self {
        Self {
            diameter_m,
            density_kg_m3: crate::IRON_ASTEROID_DENSITY,
            velocity_m_s,
            impact_angle_deg: 45.0,
        }
    }

    pub fn mass_kg(&self) -> f64 {
        let r = self.diameter_m / 2.0;
        (4.0 / 3.0) * std::f64::consts::PI * r.powi(3) * self.density_kg_m3
    }

    pub fn kinetic_energy_j(&self) -> f64 {
        0.5 * self.mass_kg() * self.velocity_m_s.powi(2)
    }

    pub fn kinetic_energy_mt(&self) -> f64 {
        self.kinetic_energy_j() / crate::MT_TNT_TO_JOULE
    }

    pub fn impact_velocity(&self) -> f64 {
        let vesc = (2.0 * G * crate::VENUS_MASS / crate::VENUS_RADIUS).sqrt();
        (self.velocity_m_s.powi(2) + vesc.powi(2)).sqrt()
    }

    pub fn crater_diameter_m(&self) -> f64 {
        let angle = self.impact_angle_deg.to_radians().sin().max(0.1);
        1.8 * self.diameter_m.powf(0.78)
            * self.impact_velocity().powf(0.44)
            * angle.powf(1.0 / 3.0)
            * crate::SURFACE_GRAVITY.powf(-0.22)
    }

    pub fn ejecta_volume_m3(&self) -> f64 {
        let d = self.crater_diameter_m();
        0.04 * d.powi(3)
    }
}

pub fn mead_impactor() -> Impactor {
    Impactor::asteroid(80_000.0, 17_000.0)
}

pub fn typical_venus_crosser() -> Impactor {
    Impactor::asteroid(100.0, 20_000.0)
}