Hi Larry! I have to do a similar case with an open channel with laminar flow, applying changes in the water level (head loss due to friction of the base/ground). Could you help me with this? I think moving mesh method or two-phase flow method could work for the air-water interface. Thanks!
Hi Laura, Moving mesh or level set could work, depending on the details. Level set is more versatile, but very computationally intensive. I worked out a physics module for the shallow water equations that works for open channel flow in plan view. I have been expecting them to include 2D shallow water equations in the software, but I have not yet seen it. Larry
I have to simulate a breaking dam with comsol. I want to start simulating a column of water collapse in air in a tank, please some idea? I'm new of comsol.
Hi I am using version 5.4 and i tried this one.I followed every steps.I added external fluid surface node(EFI) and selected upper boundary then when i added prescribed normal mesh velocity i found that under the EFI node it said the selected boundary was not applicable.I could not figure it out why it happened.Can you help me please?
I follow the method you used on your video and on the calculation step, an error message appears. It said that the final step of time did not converge. Could you please give any advice of what I'm doing wrong?
Aaron, The mesh is probably becomes too distorted for the calculations to converge. Shorten the duration of the analysis. If you must run it longer, then you should investigate how to do remeshing. Larry
Urano, I have not had a chance to try this with v5.5. I have been using an example like this since v.3.2, so I would be surprised if there were serious problems. Larry
Hi Larry! I have to do a similar case with an open channel with laminar flow, applying changes in the water level (head loss due to friction of the base/ground). Could you help me with this? I think moving mesh method or two-phase flow method could work for the air-water interface. Thanks!
Hi Laura, Moving mesh or level set could work, depending on the details. Level set is more versatile, but very computationally intensive. I worked out a physics module for the shallow water equations that works for open channel flow in plan view. I have been expecting them to include 2D shallow water equations in the software, but I have not yet seen it. Larry
I have to simulate a breaking dam with comsol. I want to start simulating a column of water collapse in air in a tank, please some idea? I'm new of comsol.
You can simulate an abrupt change in head with the shallow water equations, or with a moving mesh. This will work OK for a small dam break.
Hi
I am using version 5.4 and i tried this one.I followed every steps.I added external fluid surface node(EFI) and selected upper boundary then when i added prescribed normal mesh velocity i found that under the EFI node it said the selected boundary was not applicable.I could not figure it out why it happened.Can you help me please?
I follow the method you used on your video and on the calculation step, an error message appears. It said that the final step of time did not converge. Could you please give any advice of what I'm doing wrong?
Aaron, The mesh is probably becomes too distorted for the calculations to converge. Shorten the duration of the analysis. If you must run it longer, then you should investigate how to do remeshing. Larry
@@lcmurd1 Thank you so much. I reply you how does the remeshing respond
This seems pretty different in v5.5. I am not able to reproduce your steps :(
Urano, I have not had a chance to try this with v5.5. I have been using an example like this since v.3.2, so I would be surprised if there were serious problems. Larry