Quick Answer
The coastal permeable armor layer near-current velocity (darcy–forchheimer) calculator computes near-armor current velocity from the input values you provide.
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Find Engineering Solutions →Result Interpretation
Coastal Permeable Armor Layer Near-Current Velocity (Darcy–Forchheimer) calculator computes Near-armor current velocity in m/s using the defined engineering formula and the input values provided. Near-armor current velocity is expressed in m/s. No universal acceptance threshold is defined by this calculator.
Worked Example
Verified calculation
Given:
- Water density = 1025
- Gravitational acceleration = 9.81
- Local seabed slope (dimensionless) = 0.02
- Armor layer thickness = 2.5
- Fluid drag coefficient for armor layer = 120
Expected Result:
- Near-armor current velocity = 0.090415706600126
Engineering Interpretation:
Under the given input conditions, the calculated result is: Near-armor current velocity = 0.090415706600126 m/s.
The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from deterministically validated test cases.
Formula / Method
near-armor current velocity = sqrt((2.0 * (water density * gravitational acceleration * dimensionless) * armor layer thickness) / (fluid drag coefficient for armor layer * water density))Near-armor current velocity.
Variables
| Symbol | Label | Role | Description |
|---|---|---|---|
| water_density | Water density | INPUT | Water density |
| gravity | Gravitational acceleration | INPUT | Gravitational acceleration |
| slope | Local seabed slope (dimensionless) | INPUT | Local seabed slope (dimensionless) |
| armor_thickness | Armor layer thickness | INPUT | Armor layer thickness |
| fluid_drag_coefficient | Fluid drag coefficient for armor layer | INPUT | Fluid drag coefficient for armor layer |
| near_armor_current_velocity | Near-armor current velocity | OUTPUT | Near-armor current velocity |
Calculation Steps
- Enter the water density in kg/m^3.
- Enter the gravitational acceleration in m/s^2.
- Enter the local seabed slope (dimensionless) in 1.
- Enter the armor layer thickness in m.
- Enter the fluid drag coefficient for armor layer in 1.
- Step 1: Compute near-armor current velocity.
- Read the near-armor current velocity (m/s) from the results.
Frequently Asked Questions
What does this calculator calculate?
The Coastal Permeable Armor Layer Near-Current Velocity (Darcy–Forchheimer) calculator estimates Near-armor current velocity based on the input parameters you provide
Why is water density important in this calculation?
water density is used directly in the calculation of near-armor current velocity. Its effect on the result depends on the complete formula and the values of the other inputs.. When you enter water density in kg/m^3, the calculator uses it in the engineering formula to compute the output
How should I interpret the result near-armor current velocity?
The calculator outputs near-armor current velocity in m/s. To convert to km/h, multiply the result by 3.6. The result is computed directly from the input values using the defined engineering formula
What units should I use for the inputs?
Enter each value in the units shown next to the input field: Water density (kg/m^3), Gravitational acceleration (m/s^2), Armor layer thickness (m). Make sure all inputs use the specified units for consistent results
What assumptions does this calculator use?
This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment
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