Olga new solver (CCS)

Olga 2025.1 introduces the innovative Olga new solver (CCS), developed through the Olga CO₂ REACH joint industry project (JIP) to improve CO₂ handling capabilities. This solver provides robust and accurate simulations of CO₂ transport and injection, essential for the effective design and operation of CCS systems. It enables reliable and precise multiphase modeling with strong vaporization and condensation, optimizing capital and operational costs for CCS transport systems.

Key improvements in the new solver include increased implicitness between pressure and energy, and a reformulated flash calculation for enhanced numerical stability.

The solver operates in two stages: First updating velocities, pressure, and energy, followed by masses in each time step. By solving energy and pressure simultaneously, the pressure computation is constrained by the energy equation, boosting the solver’s stability. It is compatible only with PH-flash and PH-tables.

The development of the Olga new solver (CCS) was funded by the CLIMIT program (climit.no) under grant no. 621254 and industry partners within the Olga CO₂ REACH JIP.

• Multiphase CO₂ transportation system design.
• Operational procedures development.
• Thermal CO₂ behavior for material selection.
• Pipeline and wellbore flow analysis.

This new CCS solver ensures numerical stability and reliable solutions, offering increased accuracy without compromising simulation speed. The new Olga solver gives trustable results to develop safe and cost-effective solutions for multiphase CO₂ transportation and injection.

• Developed to provide consistent and accurate simulation results for multiphase CO₂ transportation.
• Performs more robust and even faster compared to Olga standard solver for CO₂ flow with impurities.
• Perfectly fit for simulating fast transients in CCS systems.