Is there a way to find out how long it takes for a heat transfer study to reach steady state when I run a steady state analysis in flow simulation?
If you click on project info it should tell you the time step, from there you could see at which iteration your temperature reached equilibrium and multiply that number by your time step.
Alternatively you could run the simulation with the "transient" option enabled, that should allow you to plot your results as a function of physical time.
When you look at the results, like in a goal plot for example, you should be able to set your x-axis to "physical time" which will tell you how much time has passed since the first iteration in the internal calculations of flow.
I have the same question, as the only options I see for displaying results are: CPU Time, Iterations, & Travels.
I always thought CPU Time was the time it took the solver to run NOT the simulated time domain in the model. Is that what this parameter represents though?
In the Result Summary, the CPU time is the solver only time not including the mesh time. This is why the user sees a zero value for mesh only runs for the CPU time. In a full run the Results Summary information is a summary of the solver process only (not mesh process) and it only includes the solver cpu time. In a mesh only run the cpu time is not included in the Results Summary.
Thanks Siavash, that makes sense. That said though, is there an option to compute (or show) the simulated model time or time to steady state?
Do you mean prior to run the simulation? kind of predicting how long does it take to converge?
More along the lines of: I have a heat source on a part. How long does it take that part (in the real physical world) to reach steady state conditions?
Now it makes a better sense. Let say in real life it takes almost 1 minutes (60 sec) to reach to steady state condition. So, you can simply run a transient analysis with specifying the simulation period as 80 sec. Then when you monitor the heat transfer-related results, you can see when exactly the steady state condition started, which should be around 60 sec.
I think if you have a quick look into the attached file which I prepared a very simple transient flow sim case. If you look at the goal plots, you can see that after 60 seconds the temperature reached to its steady state condition. hope it helps.
Dropbox - sample.zip
Hey Guys Thanks so much!
Turns out you need to select the "time-dependent" option in General Settings and enable a transient analysis for the program to give you any option to see "physical time" in the results. After that it shows up and Amit's initial response makes sense.
I was afraid of doing this earlier, as through the wizard upon enabling a transient analysis it asks you to enter the stop time, but I didn't want to stipulate that since I really didn't know the time to steady state. Rather I wanted the solver to determine that for me and not stop prematurely, which it does and will plot so long as you enable the transient solver and then just uncheck the "physical time" in the Finishing Calculation Control Options.
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