Quasi-Compressible Option

For a quasi-compressible option, density and energy are assumed to be constant.

No convection-diffusion is computed:(1)
∂ρ∂t=−ρ∇u MathType@MTEF@5@5@+=feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqGqFfpeea0xe9vq=Jb9vqpeea0xd9q8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr0=vr0db8meaabaqaciGacaGaaeqabaWaaeaaeaaakeaadaWcaaqaaiabgkGi2kabeg8aYbqaaiabgkGi2kaadshaaaGaeyypa0JaeyOeI0IaeqyWdiNaey4bIeTaaCyDaaaa@4334@

Therefore, the performance is improved and less computation time is needed.

The quasi-compressible option can be activated in the Radioss Engine file by /INCMP.

Using this option, the acoustic waves propagate as accurately as in the compressible case. However, it cannot be combined with the k​−​ε turbulence model.