อัปเดต 2026-09-07

Extended-period simulation (EPS)

tank level vs time

EPS steps the network through time: at each step it solves the steady hydraulics, then integrates tank levels from the net flow and advances demands along their time patterns.

Open the builder

เมื่อไรจึงใช้

Tank fill/drain studies, diurnal demand curves, storage sizing — how the system behaves over hours, not one instant.

ค่าที่ต้องกรอก

ค่า	คำอธิบาย
Time step & duration	The integration step Δt and total run length.
Demand patterns	Per-node multiplier vs time applied to the base demand.
Tank geometry	Area/diameter — converts net flow into a level change.

คำนวณอย่างไร

A quasi-steady march: solve the GGA at the current levels/demands, integrate each tank’s volume by its net flow over Δt, update levels, advance the patterns, repeat. Emptied or overflowed tanks raise a loud scope note.

สมการ

Tank mass balance

\frac{d V}{d t} = \sum Q_{in} - \sum Q_{o u t}

Integrated each step as ΔV = Q_net·Δt; the level follows from the tank geometry.

Level update (constant area)

h (t + Δ t) = h (t) + \frac{Q _{n e t} Δ t}{A _{t ank}}

A_tank = cross-sectional area. A non-prismatic tank uses its volume–level curve instead.

Time-varying demand

Q_{i} (t) = Q_{i, base} \cdot M (t)

M(t) = the node’s pattern multiplier at time t.

ที่เกี่ยวข้อง

Tank Water quality

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