(Credible) Multiscale Modelling and Simulation.- Novel Hierarchical Decision Tree Frameworks Introducing Tree Method Bagging-Stump Integration and Height Optimization.- Modelling Heat Conduction between Two Contacting Particles in Vacuum Insulation Panels Made with Granular Porous Media.- Multiscale Parallel Simulation of Malignant Pleural Mesothelioma via Adaptive Domain Partitioning an Efficiency Analysis Study.- Node-level Performance of Adaptive Resolution in ls1 mardyn.- A Multiscale Modeling Framework for Organizational Resilience: Integrating Agent-Based, Discrete Event, and System Dynamics Approaches.- mUQSA - An Online Service for Uncertainty Quantification and Sensitivity Analysis.- FUMEplot: a Prototype Tool for Automated Visualisation of Uncertainties in Ensemble Modelling Outputs.- AI-enhanced Agent-based Modelling Approach for Forced Displacement Predictions.- Numerical Algorithms and Computer Arithmetic for Computational Science.- On Floating Point Approximation of the Reciprocal Cube Root Function.- Fourier Error Analysis of Caputo Derivative Approximations based on Lagrange Interpolation over Uniform Mesh.- Time and Energy Consumption of Multithreaded Matrix Factorization using Various Compilers Optimizations.- Quantum Computing.- Modeling the Cyclic Bandwidth Problem in QUBO for Quantum Annealing.- Optimization Framework for Reducing Mid-circuit Measurements and Resets.- Quantum-Classical Dual Kernel SVMs for Power Quality Classification.- Quantum-aware Transformer Model for State Classification.- Hyperspectral Image Segmentation with a Machine Learning Model Trained using Quantum Annealer.- Classification of the Polish Handwritten Letters by the use of Quantum Convolutional Neural Network.- Retrieval-Augmented Generation.- AggTruth: Contextual Hallucination Detection using Aggregated Attention Scores in LLMs.- CiteVerifier: How Good Are Citation Verifiers and How to Use Them?- From Statement of Facts to Statutory Provisions Efficient Retrieval of Relevant Legislation.- PoliChat: Retrieval Augmented Generation on University Documents and Regulations.- Simulations of Flow and Transport: Modeling, Algorithms and Computation.- Isogeometric Galerkin-characteristic Analysis for Miscible Flows in Porous Media.- An Unconditionally Stable Parallel Splitting Algorithm for the Coupled Stokes-Parabolic Equation Based on the Three-Field Biot Model.- A Thermodynamically Consistent Model for Compressible Fluid Flow in Fractured Porous Elastic Media.- {tt DarcyLite} Modules for Property-preserving Transport Solvers.- Natural Convection in Periodically Heated Porous-fluid System under Local Thermal Non-equilibrium Conditions: A Numerical Study for Enhanced Thermal Management.- Development of a Library for Far-field Sonic Boom Prediction in OpenFOAM.- Numerical Analysis of Dolphin Kick in Competitive Swimming with Free Surface Effects.- DNS of Bubble Dynamics in the Wobbling Regime using the Unstructured Conservative Level-Set Method.

The 6-volume set constitutes the workshop proceedings of the 25th International Conference on Computational Science, ICCS 2025, which took place in Singapore, Singapore, during July 7 9, 2025.

The 137 full papers and 32 short papers presented in these proceedings were carefully reviewed and selected from 322 submissions. The papers are organized in the following topical sections:

Volume I:

Advances in high-performance computational earth sciences: numerical methods, frameworks & applications; artificial intelligence approaches for network analysis; artificial intelligence and high-performance computing for advanced simulations; and biomedical and bioinformatics challenges for computer science.

Volume II:

Computational health; computational modeling and artificial intelligence for social systems; and computational optimization, modelling and simulation.

Volume III:

Computational science and AI for addressing complex and dynamic societal challenges equitably; computer graphics, image processing and artificial intelligence; computing and data science for materials discovery and design; and large language models and intelligent decision-making within the digital economy.

Volume IV:

Machine learning and data assimilation for dynamical systems; and multi-criteria decision-making: methods, applications, and innovations.

Volume V:

(Credible) Multiscale modelling and simulation; numerical algorithms and computer arithmetic for computational science; quantum computing; retrieval-augmented generation; and simulations of flow and transport: modeling, algorithms and computation.

Volume VI:

Smart systems: bringing together computer vision, sensor networks and artificial intelligence; solving problems with uncertainty; and teaching computational science.