FieldengFluid & Pressure
Water Hammer Screening
Joukowsky surge estimate ΔP = ρ a ΔV. Not a transient simulation.
Fluid & Pressure
Joukowsky surge estimate ΔP = ρ a ΔV. Not a transient simulation.
App id: FLUID-25. Reference version 1.0.
How to fill it
Fill the inputs. The tool shows the outputs.
On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.
Formula
ΔP = ρ a ΔVInputs
| Name | Unit |
|---|---|
| Density | kg/m3 |
| Wave speed | m/s |
| Velocity change | m/s |
Outputs
| Name | Unit |
|---|---|
| Transient pressure change (hero result) | kPa |
Diagnose
Observations are context. They do not pass or fail a structure. See Diagnose.
| When | Observation | Severity |
|---|---|---|
Every result | Joukowsky screening only | info |
Assumptions
- Instantaneous closure / velocity change.
- Does not include valve time, pipe elasticity, or boundary conditions.
Provenance
- Joukowsky equation for instantaneous velocity change.