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NeqSim (Non-Equilibrium Simulator) is a Java library for estimation of fluid behavior and process design for oil and gas production. The fundamental theory including the object oriented structure of NeqSim is described in a PhD thesis from NTNU.

This Wiki describes the steps needed to get familiar working with NeqSim in the Java programming language. Use the right menu to navigate in the documentation.

NeqSim toolboxes are avalable via GitHub for alternative programming languages.

• Matlab
• Python
• .NET (C#)

NeqSim NeqSim is an abbreviation for Non-equilibrium Simulator. It is a tool for thermodynamic and fluid-mechanic simulations. NeqSim enables simulation of the most common unit operations you find in the petroleum industry. The basis for NeqSim is a library of fundamental mathematical models related to phase behavior and physical properties of oil and gas. NeqSim is easilly extended with new methods. NeqSim is built upon six base modules:

1. Thermodynamic Routines
2. Physical Properties Routines
3. Fluid Mechanic Routines
4. Unit Operations
5. Chemical Reactions Routines
6. Parameter Fitting Routines
7. Process simulation routines

File System and examples: neqsim/: main library with all modules

neqsim/thermo/: Main path for thermodynamic routines neqsim/thermo/util/examples/: examples of use of Thermodynamic Models and Routines

neqsim/thermodynamicOperation: Main path for flash routines (TPflash, phase envelopes, etc.) neqsim/thermodynamicOperation/util/example/: examples of use of thermodynamic operations (eg. flash calculations etc.)

neqsim/physicalProperties: Main path for Physical Property methods neqsim/physicalProperties/util/examples/: Examples of use of physical properties calculations

neqsim/physicalProperties: Main path for Physical Property methods neqsim/physicalProperties/util/examples/: Examples of use of physical properties calculations

neqsim/processSimulation: Main path for Process Simulation Calculations neqsim/processSimulation/util/examples/: Examples of use of Process Simulation calculations

changelog.txt : History of what changed between each version. license.txt: license document

Third party open source projects used by NeqSim EJML - for liner algebra calculations (http://ejml.org) JAMA - for linear algebra calculations (https://math.nist.gov/javanumerics/jama/) Commons Math - for various mathematical operations (http://commons.apache.org/proper/commons-math/) JFreeChart - for displaying charts (http://www.jfree.org/jfreechart/) Ucanaccess - for working with the local MSAccess database (http://ucanaccess.sourceforge.net/site.html)

How to build NeqSim from source code NeqSim can be built using the Maven build system (https://maven.apache.org/). All NeqSim build dependencies are given in the pom.xml file.