Fluid models in pressure acoustic interface

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in pressure acoustic interface, with a frequncy domain analysis I can choose "user-defined attenuation" under the fluid model to select and I can enter the value of the coeffcient in dB/m. When I switch to a time-dependent study, I do not have the same choice, the user-defined attenuation is not available. How I can obtain the same situation of the frequency domain analysis?


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