Slow valve closure with vapour cavities
Does the model capture cavities forming and collapsing in a pipe?
Bergant (1999)
Version 0.1.0
- Right answer
- Laboratory or field measurements · Bergant (1999)
- Results
- No model run yet · see them ↓
- Must
- get the peak pressure within 5 %
What happens
A laboratory pipe where closing a valve drops the pressure so low that the water column breaks; the cavity then collapses with a second surge.
Why it matters
Column separation causes the worst surges in real systems and is hard to model.
A good model must
- get the peak pressure within 5 %
- time the cavity collapse within 0.05 s
How models did
No model has been scored on this test yet.
Status of this test
Draft. To become candidate it needs: data licence verified; all inputs available; reference (truth) available.
Technical details for reviewers Checks, reference, inputs, sources
What this test still needs
- inputs/rig.json: Pipeline rig geometry, valve closure law and pressure traces from Bergant & Simpson (1999); raw traces need permission from the authors. Source: University of Adelaide (Simpson) / Litostroj Power (Bergant)
- Reference data: request from authors.
Checks and why each limit was chosen
| Check | Difference measured as a percentage of | Latest | Difference | Why this check |
|---|---|---|---|---|
| peak_pressure peak_error of p · in the score | already a percentage | – | Peak pressure within 5% of published Bergant & Simpson gauge peak. | |
| arrival arrival_time_error of p · timing, beside the score | not a percentage: reported in seconds | – | Cavity collapse / pressure recovery timing within 0.05 s. |
Reference
Measured data at reference/measurements.parquet; availability: request from authors.
Promotion checklist
Only frozen tests have fixed inputs and answers. This list is computed from the manifest and the published score cards; the rules are in the method.
- ✗Data licence verifiedfor candidatelicence not yet confirmed by the rights holder
- ✗All inputs availablefor candidatepending: inputs/rig.json
- ✗Reference (truth) availablefor candidatemeasured data not yet obtained (request from authors)
- ✓Every tolerance justifiedfor candidateeach gating criterion has a rationale
- ✗A published run passesfor frozenno passing score card published yet
- ✓Order of accuracy shownfor frozennot a verification case
- ✗Two independent codes passfor frozenpassing codes: none — needs a second, independently written solver or engine
- ✗Maintainer review recordedfor frozenno maintainer review recorded
Inputs
| File | Role | Format | SHA-256 | Get it |
|---|---|---|---|---|
inputs/rig.json | geometry | json | pending Pipeline rig geometry, valve closure law and pressure traces from Bergant & Simpson (1999); raw traces need permission from the authors. |
About this test
Physics
Transient pressurized flow with slow valve closure. Vapour cavities form when pressure drops to vapour pressure (column separation); collapse produces secondary pressure peaks.
Citation
Bergant, A., and Simpson, A. R. (1999). "Pipeline column separation flow regimes." J. Hydraul. Eng., 125(8), 835–848. https://doi.org/10.1061/(ASCE)0733-9429(1999)125:8(835)
Sources
- Bergant, A., Simpson, A. R. (1999). Pipeline column separation flow regimes. doi:10.1061/(ASCE)0733-9429(1999)125:8(835)
Test A1P-021_bergant_slow_closure_column_sep · version 0.1.0 · data licence TBD-confirm