";
return;
}const D_m = D / 1000; // convert mm to meters
const StrouhalNumber = 0.2; // Approximate value
const frequency = (StrouhalNumber * V) / D_m; // Hz// Acoustic Strouhal number: Sa = f × D / c
const Sa = (frequency * D_m) / c;let riskLevel;
if (Sa >= 0.2 && Sa <= 0.5) {
riskLevel = "⚠️ Medium Risk – Potential for resonance and vibration.";
} else if (Sa > 0.5) {
riskLevel = "❌ High Risk – Vibration likely, review design.";
} else {
riskLevel = "✅ Low Risk – Vibration unlikely.";
}resultDiv.innerHTML = `
Calculated Frequency: ${frequency.toFixed(2)} Hz
Acoustic Strouhal Number (Sa): ${Sa.toFixed(3)}
FIV Risk Assessment:
${riskLevel}
`;
}