Best Hydraulic & Process Simulation Software

AI-native cloud-based engineering simulation platform for CFD, structural, thermal, and electromagnetic analysis; 900k+ users; explicit data center cooling product.

Thermal and airflow modeling for data center and mission-critical cooling design.

Free, public-domain stormwater, wastewater, and combined sewer system simulation model by the US Environmental Protection Agency -- dynamic hydrology-hydraulic-water quality simulation for single-event or continuous modeling of rainfall-runoff, pipe/channel routing, green infrastructure/LID controls, and pollutant loads; the industry-standard computational engine used worldwide for drainage design, CSO/SSO mitigation, floodplain mapping, and regulatory compliance (NPDES, CMOM, TMDL).

C1 5/5 reflects free public-domain licensing, and C2 3/5 reflects the open-source C toolkit plus community Python wrappers rather than a managed vendor API or CLI service. C4 5/5 reflects INP-native workflows with CSV and DXF export, and C5 2/5 reflects a lighter integration surface centered on ArcGIS, QGIS, PCSWMM, AutoCAD, and MicroStation.

Free, public-domain water distribution system modeling software by the US Environmental Protection Agency -- performs extended-period simulation of hydraulic and water-quality behavior within pressurized pipe networks (pipes, pumps, valves, tanks), tracking flow, pressure, water age, chlorine residuals, and contaminant transport; provides a C Programmer's Toolkit (DLL with 50+ functions) for custom integration; the industry-standard computational engine underlying most commercial water-distribution modeling packages worldwide.

C1 5/5 reflects free public-domain licensing, and C2 3/5 reflects the C Programmer's Toolkit plus community Python wrappers rather than a managed vendor API or CLI service. C4 5/5 reflects INP-native workflows with CSV and DXF export, and C5 2/5 reflects a lighter integration surface centered on ArcGIS, QGIS, InfoWater Pro, and WaterGEMS.

Integrated catchment modeling software for stormwater, wastewater, and flood network analysis -- 1D/2D hydraulic and hydrologic simulation, cloud or local compute, collaborative scenario management, and rule-based network design for sewer and stormwater engineers at utilities and engineering consultancies.

C1 4/5 reflects published annual pricing, C2 3/5 reflects the Ruby scripting API plus Autodesk cloud endpoints, and C5 3/5 reflects AutoCAD, Autodesk Storm and Sanitary Analysis, and Autodesk Water Infrastructure integrations. The documented file surface centers on CSV, GIS, and SWMM import for stormwater, wastewater, and flood modeling.

Water distribution system modeling and simulation software for hydraulic analysis, water quality modeling, fire flow analysis, energy management, and pipe network calibration -- part of Bentley's OpenFlows portfolio, serving municipal water utilities and engineering consultants.

C1 4/5 reflects published Essentials-through-Ultimate pricing, C2 3/5 reflects the WaterGEMS .NET API and iTwin Platform API, C4 2/5 reflects the proprietary WHM native format, and C5 3/5 reflects Bentley OpenFlows, iTwin, ProjectWise, and ArcGIS integrations.

Hydraulic transient and surge-analysis software for water distribution and wastewater piping systems. Bentley now licenses HAMMER through the OpenFlows Water family, where the current Standard, Advanced, and Ultimate tiers include the named HAMMER transient-analysis capability.

C1 3/5 reflects the $3,354 Standard tier that first includes HAMMER, C2 2/5 reflects desktop model authoring with no public standalone API, and C5 4/5 reflects OpenFlows WaterCAD, OpenFlows WaterGEMS, ArcGIS, MicroStation, AutoCAD, and ProjectWise integrations. C4 3/5 reflects INP, DGN, DXF, GIS, and CSV interoperability.

Advanced stormwater, wastewater, watershed, and water distribution modeling software by Computational Hydraulics International (CHI) -- built on the EPA SWMM5 engine with a powerful GIS interface, 1D/2D hydraulic modeling, intelligent scenario management, model calibration tools, and green infrastructure/LID design; used worldwide by engineering consultants, municipalities, and utilities for drainage design, floodplain mapping, CSO/SSO analysis, and water quality modeling.

C1 4/5 reflects published annual pricing from USD 1,600 to USD 4,400 plus a 30-day trial, and RF2 keeps C2 1/5 because no public REST API or CLI is documented for the desktop application. C4 3/5 reflects INP, SHP, CSV, DXF, and DWG workflows, and C5 2/5 reflects EPA SWMM5, EPA EPANET2, ArcGIS, and QGIS integration.

Standalone Windows stormwater hydrology and hydraulics modeler (TR-20, TR-55, SBUH; ponds, outlets, routing) in use since 1986. Licensed perpetually by node count (5-node $275 to 40-node $1,100; 20-node $825 is the most common) with an annual-license option and a free sample version. Direct CAD watershed import (v10+); desktop-only with no API.

C1 4/5 reflects published perpetual node-based pricing plus a free sample version, while C2 1/5 reflects no public API, CLI, MCP, webhook, or scripting surface. C4 3/5 reflects DWG and DXF watershed import as the documented file interface.

Specialized water distribution and transient hydraulic modeling software; pipe network analysis and water system simulation.

Standalone water distribution and transient hydraulic modeling specialist; 50+ years development history. Pipe network analysis, steady-state and transient flow simulation for municipal water systems and engineering consultants.

Hydrodynamic flood and stormwater simulation software; 1D/2D/3D modeling for flood risk, stormwater, and hydraulic analysis.

1D/2D/3D hydrodynamic flood and stormwater simulation by BMT (Dutch independent company). Active in UK/AU markets; used by consulting firms for FEMA and environmental agency flood risk assessments. Advanced solver for flood mapping and climate resilience analysis.

1D/2D hydraulic flood modeling and simulation software by Jacobs; suite for flood risk analysis, mapping, and hydraulic design.

Modern 1D/2D hydraulic flood modeling by Jacobs (formerly Halcrow/ISIS). Distinct from TUFLOW and MIKE; primarily used for flood risk assessment, mapping, and hydraulic design in Europe and Commonwealth markets. v7.0+ release; active development.

Modular electrical power system analysis suite; short circuit, arc flash, coordination, and load flow analysis.

Modular power system analysis suite (50+ years, 50k+ engineers globally); short circuit, arc flash, protection coordination, load flow. Competitor peer to ETAP and EasyPower. NFPA 70E/OSHA compliance workflow included.

Electromagnetic transient (EMT) simulation for power systems; HVDC, renewables, power electronics, and grid integration modeling.

Electromagnetic transient (EMT) simulation by Manitoba Hydro International; specializes in HVDC, renewable grid integration, and power electronics. Peer tool to DIgSILENT and ETAP (Capterra 4.4/5, 17 reviews). Active development.

Arc flash and power system design software; NFPA 70E and OSHA compliance; tiered editions for electrical design and analysis.

Arc flash and power system design (since 1984); NFPA 70E/OSHA compliance focus. Acquired by Bentley Systems (Feb 2023) but retained as distinct domain/product. Tiered editions and active development.

Electrical power systems analysis suite (load flow, arc flash, short circuit, coordination); standard AEC electrical tool for Tier 3/4 UPS/generator design since 1972.

Power system protection coordination and short-circuit analysis for mission-critical infrastructure.

Water distribution system modeling and management software built on ArcGIS Pro -- provides hydraulic analysis, criticality analysis, pressure transient modeling, leakage detection, fire flow analysis, and what-if scenario simulation for water utilities and engineering firms planning, designing, and operating water distribution networks with spatial analysis and GIS integration.

RF1 keeps C1 2/5 because pricing is quote-only, and C2 2/5 reflects Ruby scripting plus Autodesk-linked simulation endpoints rather than a broadly accessible standalone API or CLI. C4 3/5 reflects GIS, SHP, and CSV workflows with INP export, and C5 3/5 reflects ArcGIS Pro, ArcGIS Online, Autodesk Water Infrastructure, and AutoCAD integration.

Wastewater treatment plant modeling and simulation software by Hydromantis (a Hatch company) -- the first commercially released dynamic wastewater treatment plant simulator, providing a drag-and-drop interface with the industry's largest library of unit process models (Mantis2 biological model, carbon/nitrogen/phosphorous removal, sulfur/selenium, GHG carbon footprint) for designing, optimizing, and managing municipal and industrial wastewater treatment plants; includes steady-state and dynamic simulation, sensitivity analysis, process optimization, scenario management, and Python scripting (Pro+ tier).

C1 3/5 reflects published annual pricing from USD 3,700 to USD 10,400 plus a trial, and C2 2/5 reflects Python scripting plus Model-as-a-Service access only on the Pro+ tier rather than a broadly accessible API or CLI. RF2 remains attached because delivery is desktop-first, and C4 3/5 reflects CSV import and export while C5 2/5 reflects a narrow documented integration surface centered on Python.

Stormwater modeling software with EPA SWMM graphical interface. FEMA-approved for National Flood Insurance Program studies. Supports urban and rural stormwater design with automated watershed delineation, detention pond design, and green infrastructure readiness.

EPA SWMM hydraulic modeling engine with multiple hydrology methods (Rational, SCS, CUHP, SBUH) for watershed and detention analysis.

High-voltage transmission power flow and electric grid simulation software; up to 250k bus modeling for power system analysis.

Transmission-level power flow simulation (up to 250k buses) for high-voltage grid analysis. Independent U.S. company (Champaign, IL); specialist in power system steady-state and transient stability analysis. Distinct from distribution-focused tools (ETAP) and academic solvers (SKM, PSCAD). RF1: no public pricing; contact-sales only.

End-to-end power system analysis software; 40+ years; generation, transmission, and distribution network modeling and analysis.

Comprehensive power system analysis (gen/transmission/distribution); 40+ year independent German company. Peer-grade tool alongside ETAP and PSCAD in Wikipedia power-engineering-software table. Steady-state, dynamic, and EMT simulation; active R&D. RF1: no public pricing; contact-sales only.

Cloud-based CFD platform for data center thermal and airflow simulation; Ansys Fluent-powered; drag-and-drop component library; raised-floor and in-row cooling modeling.

Thermal and airflow modeling for mission-critical data center cooling design; not general-purpose CFD.

Cloud-based hydraulic modeling platform for UK/EU drainage network design. Optimizes storm and foul water systems with SuDS (Sustainable Drainage Systems) support and EPA SWMM engine for cost-effective compliant drainage design.

EPA SWMM-powered hydraulic modeling with SuDS design, network analysis, compliance optimization, and template-based rapid workflow.

Water system modeling platform for networks, flood risk assessment, and hydraulic simulation; European competitor to Bentley OpenFlows.

C1 2/5 reflects quote-only enterprise pricing with no public rates (RF1); C2 2/5 reflects no documented API/CLI; C3 3/5 reflects cloud deployment via Azure; C4 3/5 reflects cloud-native but proprietary formats; C5 1/5 reflects Azure-only integration path. Esri partner solution, academic discounts available.

Mission-critical power design + real-time operations platform; protects $100B+ in customer assets; named clients eBay, Bank of America, FAA, DoD.

Real-time power systems monitoring and protection for mission-critical infrastructure.