Simulation of Gas Mixture Dynamics in a Pipeline Network using Explicit Staggered-Grid Discretization

Yan Brodskyi, Vitaliy Gyrya, Anatoly Zlotnik

correctmedium confidence

Category: Not specified
Journal tier: Strong Field
Processed: Sep 28, 2025, 12:56 AM
arXiv Links: Abstract ↗PDF ↗

Audit review

The paper derives an explicit nodal pressure formula, boundary mass-flux updates, and boundary density updates for ideal and linearly non-ideal equations of state using the staggered discretization, upwinded friction, and instantaneous nodal mixing. The candidate solution reproduces the same derivation structure: summing the nodal mass balances, using the boundary momentum update to eliminate unknown boundary flows, substituting the EoS, and enforcing mixing to obtain nodal compositions. Minor notational differences (local reorientation of pipes and whether the compressor ratio μ_k,n is set to 1 in some displayed formulas) are acknowledged and correctly interpreted. No substantive discrepancies were found beyond standard positivity/nonsingularity assumptions.

Referee report (LaTeX)

\textbf{Recommendation:} minor revisions

\textbf{Journal Tier:} strong field

\textbf{Justification:}

The work provides a correct and practically important fully explicit scheme for compositional gas network transients with compressors and non-ideal effects. The derivations are sound and align with standard discretizations; the principal innovation is the explicit nodal coupling leveraging staggered updates and mixing. Minor clarity issues remain (notably consistent use of the compressor ratio in displayed formulas), but these are easily addressed.