Steady State solution and Transient solution

ari003 · March 9, 2019, 07:28

What is the difference between steady state and transient solution?
Based on the application how can I figure out that which solution to use?
It will be really helpful if someone helps.

LuckyTran · March 9, 2019, 13:14

steady state means its time independent and transient means its allowed to change in time.

For most cases steady state works, because you are doing RANS which solves for the temporal-averaged velocity.

But if you have a time-dependent velocity inlet for example, then the solution would obviously also me time-dependent and you would need to do a transient simulation.

Sometimes there are inherent unsteady effects in the flow, like vortex shedding, which sometimes necessitates a transient simulation.

March 9, 2019, 07:28	Steady State solution and Transient solution	#1
ari003 Senior Member Arijit Saha Join Date: Feb 2019 Location: Singapore Posts: 132 Rep Power: 7	What is the difference between steady state and transient solution? Based on the application how can I figure out that which solution to use? It will be really helpful if someone helps.

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March 9, 2019, 13:14		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,747 Rep Power: 66	steady state means its time independent and transient means its allowed to change in time. For most cases steady state works, because you are doing RANS which solves for the temporal-averaged velocity. But if you have a time-dependent velocity inlet for example, then the solution would obviously also me time-dependent and you would need to do a transient simulation. Sometimes there are inherent unsteady effects in the flow, like vortex shedding, which sometimes necessitates a transient simulation.