[NickFL]

Yes the variable t (time) has units of seconds. And then the [Hz] is of course [1/s], so the product of these two is unitless. The sin of this dimensionless quantity is also dimensionless, so we cannot simply apply it to the velocity because the velocity needs a [length/time]. You solved it one way by multipling by 1[m/s]. Or you could have simply added [m/s] to the 0.3 value.



The 0.25 [s] gives us a rough estimate of the time it takes a fluid packet to enter and leave the domain if the flow rate was constant. Since 10 [s] is much larger, there would be little need to simulate so long. But with a sinusoidal inlet velocity this rough estimate will be much too short.

[clod995]

As always, thanks a lot for your help. I will go in the next simulations to change the number of time steps, I will certainly lower it to have simulations that last less.
Every now and then the geometry error appears again, the one I posted previously and, even if I change the name, nothing happens. I put the valves on a Wheatstone bridge, so the geometry has become considerably more complicated, I hope to be able to solve it. I think it's because I sent 5 simulations together, so the computer is more likely to give me errors.

[clod995]

This is the error. I tried, like the last time, to change the name, but it don't work

[NickFL]

It is difficult to say from that error. What filetype are you using? IGES? I have had all kinds of wierd problems with DesignModeler. For example, it has trouble with , and . for the decimal. Or it doesn't like certain characters in file names (like ö or ü here in Germany). Or even from certain network locations.



Is there a reason you cannot simply create the 2D drawing in DesignModeler without an import?

[clod995]

yes, i'm using IGES. I tried choosing "a" as the name but it didn't work. The geometry is very complicated because it is a structure with 4 valves arranged in a certain way with a pipe in between.
I work on the university remote which is an old, slow and problematic computer, especially in terms of graphics. I struggle even to name the parts for ansys fluent !!!
I also asked my professor to help me, but he doesn't know how to solve the problem either. Maybe I should try to open the geometry with Spaceclaim but that Ansys has DesignModeler set.
I will never stop thanking you for your patience in answering me

EDIT: I solved it by changing the name of the Workbench folder... It is absurd
Can I continue to ask you things here or do I open new threads in the forum? Because I guess I'll have another thousand doubts but I don't want to bother you all the time

[NickFL]

IGES are notorious for how difficult they are to work with (there is a saying that they should be called "I guess" files). But my understanding of IGES is that it is just points, lines and surfaces. Because of this, the error COULD be that there is an inconsistency between the decimal in the file and what ANSYS expects. What is the decimal in the CAD system? What is DesignModler expecting? Can you open the IGES in another CAD package?



Yes I know it is terrible that ANSYS isn't even consistent in its products. For instance, in Fluent you always have to use . as the decimal and DesignModeler/Meshing it can be the , (depending on your system language).

[clod995]

Sorry for the absence but yesterday was my birthday and I took a break from university, at least for a day.
Thank you so much for your help. I wanted to ask you another question and if you can help me, as always, I will be infinitely grateful.
Practically the structure I'm studying is that of the first photo (mine you see in the second photo was simplified at the beginning). As already mentioned it is a Wheatstone bridge with 4 Tesla valves. Basically I sent a transient simulation trying to understand what happens to that tube which is in the lower part (in the second photo I indicated it with an arrow). The structure is 2D, I thought it was easy to insert a monitor in that part but I don't think I succeeded. Since I can't create a plane because I don't have a 3D structure (the plane should cut the figure perpendicularly and therefore result in the view, a line), I tried to draw a line, first manually, then I adjusted the points (as you can see in the third photo) but there is something wrong. I launched the simulation but I don't think I took that as a monitor. If I try to click on "compute" when I select the line, it gives me the error of the fourth image. How do I know if the monitor has been installed or not and if it is working?
Thank you for your help, again

[NickFL]

First, Happy (belated) Birthday.


Yes you should be able to obtain what you want from a line. I assume the line-7 has a nonzero definition of x and y unlike the line-10 surface in your image.



If you right-click on the line under Results-Surfaces and select Add to Active Window (or something similar every release calls it a little different), does this appear where you want it to on your model? Then under Report Defintions, make sure you have this line selected under surfaces. The error message you are recieving seems to think that this is empty. And then below there should be a Compute button. If everything is right, this should give you a value (if you have a data file in memory).