Learning Forum

[dineshad]

There is water tank half filled and there is certain water flow rate continuously flowing from inlet to outlet. I have to see the turbulence and pressure drop between inlet and outlet. Should I go for steady state or transient simulation?

[SRP]

Hi,

Choosing between a steady-state and transient simulation depends on the behavior of the flow you are studying. If the flow shows transient behavior, such as time-dependent changes or fluctuations, a transient simulation is necessary. However, if the flow is expected to reach a steady state without time-dependent effects, a steady-state simulation may be sufficient.

Steady state: when you are interested in the final, stable state of the flow, where conditions do not change with time.

Transient state: when you need to capture the time-dependent behavior of the flow and pressure.

[dineshad]

Thanks for the prompt reply. I tried steady state but there the residuals after reaching near convergence value, again went up. So there are lot of change coming at inlet and outlet pressures and that is one of my outputs. 

[SRP]

Hi,

Steady-state simulations may have difficulty converging if the flow is unsteady since the flow dynamics are complex and potentially time-dependent. Residuals rising after approaching convergence indicates the presence of transient effects that cannot be captured accurately in a steady-state. The difficulties with steady-state convergence and the nature, a transient simulation is recommended. This approach will allow you to capture the time-dependent turbulence and pressure changes more accurately.

[dineshad]

Thank you so much for your prompt help. It helped a lot.