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-[Thermodynamic and Gauge Pressure](#thermodynamic-and-gauge-pressure)
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-[Initial State and Non-Dimensionalization](#initial-state-and-non-dimensionalization)
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-`FREESTREAM_VEL_EQ_MACH`: Reference pressure is chosen such that the non-dimensional free-stream velocity equals the Mach number: $$p_{ref} = \gamma p_{\infty}$$.
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-`FREESTREAM_VEL_EQ_ONE`: Reference pressure is chosen such that the non-dimensional free-stream velocity equals `1.0`: $$p_{ref} = Ma^2_{\infty} \gamma p_{\infty}$$.
The physical definition for the thermochemical nonequilibrium (NEMO) solvers is similar to the compressible solvers, but with additional parameters to specify. The free-stream values are not only used as boundary conditions for the `MARKER_FAR` option, but also for initialization and non-dimensionalization. That means even if you don't have any farfield BCs in your problem, it might be important to prescribe physically meaningful values for the options.
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### Free-Stream Temperatures ###
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Thermodynamic state is specified using the same options as the compressible solver, with the addition of the free-stream electronic temperature. This can be specified using the `FREESTREAM_TEMPERATURE_VE` option in the config file. For a free-stream in equilibrium, this is typically the same value as specified in the `FREESTREAM_TEMPERATURE` option.
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### Chemical Composition and Mass Fractions ###
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The NEMO solvers require a specification of thermochemical nonequilibrium library using the `FLUID_MODEL` option, either `SU2_NONEQ` if using the SU2 built-in thermochemical library, or `MUTATIONPP` if using the Mutation++ thermochemical library.
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A chemistry model, consisting of a set of flow species, thermochemical properties, and chemical reactions, is specified using `GAS_MODEL`. The names of these models are specific to the thermochemical library. If using the `SU2_NONEQ` option the choices are `ARGON`, `N2`, `AIR-5`, and `AIR-7`.
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Free-stream mass fractions must also be specified in list using the option `GAS_COMPOSITION`. The mass fractions are specified as decimal values in the order of the species in the gas model. For example, an AIR-5 mixture of 77% oxygen and 23% nitrogen would be expressed as (0.77, 0.23, 0.00, 0.00, 0.00).
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Every solver has its specific options and we refer to the tutorial cases for more information. However, the basic controls detailed in the remainder of this page are the same for all problems.
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## Specifying a Fluid Model ##
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For fluid simulations, a model defining the equation of state and thermodynamic properties of the fluid or mixture is required. This is selected using the `FLUID_MODEL` option in the config. Available fluid models in SU2 include:
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| Option Value | Description |
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|---|---|
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|`STANDARD_AIR`|**Air model with ideal gas EOS**|
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|`IDEAL_GAS`|**Arbitrary fluid with ideal gas EOS**|
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|`VW_GAS`|**Arbitrary fluid with Vander-Waals EOS**|
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|`PR_GAS`|**Arbitrary fluid with Peng-Robinson EOS**|
Some fluid models require the specification of additional parameters, with the full set of required options available in the configuration file template.
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