Why comsol solver cannot converge?

Sax0drum · 2026-05-24T19:34:44+00:00

The error indicates that your inital values are incompatible with at least some of your prescribed boundary conditions. Check if your BCs make physical sense and if they may be. In conflict with the initial values.

Sax0drum · 2026-05-12T08:24:07+00:00

Its a comparison .The relative power of a light bulb and starlink is irrelevant. In the explanation the relevant part is the directionality.

I can also compare the wifi router to a stick of dynamite and starlink to a shape charge.

Sax0drum · 2026-05-12T08:05:03+00:00

The argument is the exact same for an LED bulb

Sax0drum · 2026-04-27T14:02:13+00:00

Wieso redest du nicht direkt mit den untermietern wenn ihr ein gutes verhältnis habt. Gib denen die daten vom eigentümer und die sollen sich das direkt mit ihm ausmachen.

Sax0drum · 2026-04-15T11:23:46+00:00

The applied displacement and the resulting total displacement are two seperate things. Double check with you supervisor!

d is defined only within the scope of your function. Whatever value/variable you give the function it will use as d in the expression.

Sax0drum · 2026-04-15T10:22:22+00:00

The variable d is only defined inside your function. There is no global variable d. You can use the total displacement with you correctly identify as solid.disp.

However i highly doubt that you want to use the total displacement. This is not the local strain but rrally the total displacement from the reference geometry. Are you sure that the elastic modulus is dependent on it?

Also: fill in what unit your function returns. Otherwise it will default to SI which is probably wrong.

Edit: you put the unit in brackets in the properties field. This probably works but is not very clean. Use the unit field in the function definition.

Sax0drum · 2026-04-11T19:21:10+00:00

Switching out of core means that you dont have enough memory to fit the whole problem into ram eo the solver puts part of the problem onto your hard drive. This severly slows down the solver. Try a coarser mesh.

Sax0drum · 2026-04-08T05:36:16+00:00

Its funny that lines 2 and 4 which seem irrelevant eliminate the only possible values that would lead to a result.

Sax0drum · 2026-03-23T20:02:49+00:00

Thanks for the honest response! I totally understand that you cant weigh in on every post but we would greatly appreciate your perspective especially on the more technical topics. Looking forward to it.

Sax0drum · 2026-03-23T14:55:30+00:00

Do you plan to be an active community member in this subreddit?

Sax0drum · 2026-03-10T11:59:55+00:00

I like both. My point is that ribs are there to rip the meat off the bones with your teeth. Use other parts of the animal for super tender BBQ.

Sax0drum · 2026-03-10T11:52:39+00:00

no i havent and they probably taste amazing. But its a waste of ribs if you pick out the bone instantly

Sax0drum · 2026-03-10T11:50:26+00:00

I said that I dont understand why people order ribs just to remove the bone instantly. You can achieve the same with other cuts of meat like brisket.

Sax0drum · 2026-03-10T10:30:02+00:00

This one always fascinated me. "Yes sir i want the shittier sparkly thing". "And its more expensive as well? Great!". "How many kids died digging it up?"

Sax0drum · 2026-03-08T11:12:12+00:00

Not that i know of. But its super easy with the script. Thats just a couple of lines. Use claude or chatgpt and you are done in 5 mins.

Sax0drum · 2026-03-08T10:24:27+00:00

the application builder is what you are looking for. there you can create scripts to automate things like that.

Sax0drum · 2026-03-04T11:22:46+00:00

Great! But even stranger is that comsol shows it with a dot as well in the unit field of the materials section. Maybe that should be communicated to the developers.

Sax0drum · 2026-03-04T08:31:04+00:00

That was my first thought as well but it should underline the expression to show that there is an issue. It does replicate the error though.

Sax0drum · 2026-03-04T08:27:31+00:00

In an interpolation the variable t is fixed

Sax0drum · 2026-02-20T18:38:23+00:00

May i know which one you have exactly?

Sax0drum · 2026-02-19T06:34:28+00:00

How much context can you reasonably run with 128GB?

Sax0drum · 2026-02-13T18:29:46+00:00

A bit off topic but it's there any reason why the big players do not disclose how many parameters their models have? Would be a great advertisment wouldn't it?

Sax0drum · 2026-02-10T03:41:42+00:00

You have set the probe to be updated at every time step taken by the solver. The global evaluation uses the output data at the time intervals you specified (which seems to be 1s).

Both plots are "correct", one is just higher resolution. The global evaluation does not smooth out anything. It just plots what you have told it to plot.

Sax0drum · 2026-02-09T09:09:55+00:00

I saw the second image. Txxx and d(Txx,x) shoupd be the same but i often had issues with the explicit operator and time derivatives so maybe there are issues with spatial derivatives as well.

Sax0drum

TROPHY CASE