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Pressure p (SI unit: Pa). This should be computed from another physics interface using a Frequency Domain study type.
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Acoustic velocity u (SI unit: m/s). Similarly, this should be solved for in another physics interface such as the Pressure Acoustics, Frequency Domain interface.
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Speed of sound c (SI unit: m/s, default 1500 m/s).
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Ratio of specific heats γ (dimensionless, default 1.01), and
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Thermal conductivity k (SI unit: W/(m·K), default 0.61 W/(m·K)). The thermal conductivity is always assumed to be a scalar for the purpose of computing the acoustophoretic radiation force.
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