Hi, Many of the Comsol videos are part of a class I teach at Clemson University called Simulating Flow, Transport, Reactions and Deformation. I will be teaching this class in the spring semester 2025. Larry

@@lcmurd1 how can I contact you?

Thanks

That is a good idea, but it would require including mass transport with the level set simulation. There would be many applications if you could do this, but the last time I checked it was not feasible in Comsol. Maybe it will be implemented in one of the updates?

Hi ets_vid, This is an example for a class at Clemson. It could be OK for simulating droplet movement, but you should thoroughly test that application before using it with confidence.

Hi Armuttaqien, Water table contours will not cross, or at least, I cannot think of a circumstance where that would happen. However, it is a different story if you are contouring hydraulic heads measured in wells completed at different depths. In that case, vertical hydraulic gradients could causes heads at a map location to be higher or lower than the water table. That could cause contours to cross. If you are inferring flow from contours then you typically assume the aquifer material is homogeneous and isotropic, and that vertical gradients are negligible. You mentioned two wells and a related problem would occur if there were two wells completed in different aquifers. If you had some piezometers in each aquifer and then you merged those data together and tried to contour them as one dataset, that would give you nonsense. However, you could do two separate sets of contours for each aquifer and overlay them. Good luck, Larry

I had not heard of this, but I looked it up and it should be straightforward to implement. If you have access to Comsol, you could likely get this coded up and maybe the video would help get you started in the right direction. Good luck, Larry

I have not used Ansys, sorry

I expect so, but I have not used Ansys

You measure it using the bar scale given in the problem

My email at Clemson is: [email protected]

Thanks

Sure, I agree writing equations works well, and in many cases it can be faster. However, I make fewer mistakes, and I can find the mistakes that I do make faster when I write the equations in VBA. So, for me, VBA saves time in the long run.

In comsol software

No, but I agree that would be interesting. I will try it next time I dust off those models.

Hi, I have used many good sources for the material in the videos. Books by Crank and Cussler are really good for material on diffusion. Ron Falta, my colleague at Clemson, has some excellent papers on matrix diffusion. You can find all of these with a Google search. Good luck, Larry

Thank you very much ​@@lcmurd1

The Singular Matrix error is generally a pretty basic, severe problem. Should be straightforward to find it, although not enough info for me to suggest anything meaningful. Good luck, Larry

step btao koi

Can you use the shallow water approximation? That would be a good approach to simulate flow in a channel if you can justify it. Otherwise, a free surface can be simulated with a moving mesh, as in this example. However, Comsol has a new boundary condition so you no longer need to specify the velocity of the mesh, as it says in the video. This simplifies the set up, but it contradicts some things that are said in the video. You could also you a Level Set analysis to simulate a free surface. This is numerically intensive, however.

ciao! io anche sarei interessato allo svuotamento di un canale rettangolare aperto, posso chiederti se alla fine sei riuscito? grazie mille!