A new concept of semi-compressible fluids is introduced for slightly compressible visco-elastic fluids (typically rather liquids than gasses) where mass density variations are negligible in some sense, while being directly controlled by pressure which is very small in comparison with the elastic bulk modulus. The physically consistent fully Eulerian models with specific dispersion of pressure-wave speed are devised. This contrasts to the so-called quasi-incompressible fluids which are described not physically consistently and, in fact, only approximate ideally incompressible ones in the limit. After surveying and modifying models for the quasi-incompressible fluids, we eventually devise some fully convective models complying with energy conservation and capturing phenomena as pressure-wave propagation with wave-length (and possibly also pressure) dependent velocity.
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Figure 1. Dependence of the velocity of sinusoidal waves on the angular wavenumber k (left) and on the wave length λ = 2π/k (right); an illustration of the normal dispersion due to (30) and (28) for K=9 and ϱ = 1, and D = 3. Waves with ultra short lengths (or with ultra high wave numbers) have zero velocity, i.e. cannot propagate
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Dependence of the velocity of sinusoidal waves on the angular wavenumber k (left) and on the wave length λ = 2π/k (right); an illustration of the normal dispersion due to (30) and (28) for K=9 and ϱ = 1, and D = 3. Waves with ultra short lengths (or with ultra high wave numbers) have zero velocity, i.e. cannot propagate
Dependence of the velocity of sinusoidal waves on the angular wavenumber k (left) and on the wave length λ = 2π/k (right); an illustration of the anormalous dispersion due to (38) and (37) for K=1, ϱ = 1, and D > 0 very small