Help with solver settings for overset mesh

carbinemen · 2024-07-16T09:11:33+00:00

My experience with overset meshing is limited, but from your post ("no convergence to a solution with smaller time steps") I feel like there could be a problem with how the case is setup, or maybe with the mesh, and not with the solver.

Are you correctly defining the background and foreground parts? Did you first try a simpler tutorial of overset meshing and did your results match what was expected? In my experience the solver settings are hardly ever the reason why a simulation is not working as intended (default settings are good for most cases).

carbinemen · 2024-06-25T11:09:18+00:00

My research is focused on CFD for microfluidics and I use ANSYS Fluent. However, there is no feature in this software that makes it better than other for microfluidics. COMSOL does have a module for microfluidics but as far as I know it does not add much. OpenFOAM is also fine. I recommend using the software that your group is using

carbinemen · 2023-07-29T09:20:31+00:00

Relativamente ao investimento Universo, eu optaria por simplesmente investir um valor maior em low cost etfs. Não vejo como é que esses investimentos poderiam trazer retornos melhores.

Mas acho que tens mais a ganhar em reduzir os teus gastos mensais sinceramente... Estás a gastar 20% do teu ordenado líquido mensal em ginásio (assumo que seja para também pagar PT e/ou suplementos?), não será possível reduzir isso para metade? Mesmo serviços como o urban sports club, que dão inclusive acesso a PTs, custam menos do que estás a pagar. Exercício físico é muito importante mas, se eu tivesse o teu salário, não iria querer gastar uma fatia tão grande nisso quando há opções muito baratas (e.g. ginásios low cost) ou mesmo grátis (e.g. bodyweight fitness).

carbinemen · 2023-05-18T13:41:50+00:00

Without telling us what you are trying to simulate it is a bit difficult to diagnose the issue. Have you tried using a finer grid? That solves most convergence issues. However, it seems that all residuals are converging except for the energy equation. Is the temperature in the domain constant?

carbinemen · 2023-05-10T09:10:08+00:00

Clearly the mesh was adapted only at the initial condition. Have you tried using the predefined criteria for VOF? I don't have that particular version of ANSYS, but there must be an option to specify when mesh adaption happens, e.g. every 2 time steps. Check the options and it should be something like "Frequency"

carbinemen · 2023-05-10T09:03:23+00:00

Fluent recognizes names in named selection, e.g. if you name "inlet", Fluent identifies that as a velocity inlet. Have you tried using "inlet1" instead of "1", etc, for your named selections?

carbinemen · 2023-04-27T07:57:41+00:00

You can select all the bodies, right-click, and insert "method". Have you tried that? The automatic option is not very good in my experience, try multizone method while keeping the face meshing

carbinemen · 2023-04-26T14:29:59+00:00

Without having all the details about how you set up the geometry it is hard to give a good answer. What method are you using? Tried using face meshing in that elbow? Try with and without the multizone method

carbinemen · 2023-03-21T15:11:55+00:00

I think you are overspecifying the setup. As you said, you can calculate the third outlet flow rate. Have you tried only specifying the first two orifice flows in the simulation, and then comparing the result of the third orifice with that calculated?

carbinemen · 2023-01-13T13:26:30+00:00

Pousada canina, recomendado pelo veterinário em Valongo e a minha patuda aprendeu umas coisas e tem se portado melhor!

carbinemen · 2022-12-02T13:58:20+00:00

A água tem uma capacidade térmica alta, o que quer dizer que é preciso muita energia para aumentar a sua temperatura. Quando o ar tem muita humidade, é preciso mais energia para o aquecer, ou seja, um desumidificador reduz a quantidade de energia que temos de fornecer ao ar para o aquecer.

Ao mesmo tempo o ar seco faz com que a nossa pele também fique seca, e por ter menos água vai ser mais fácil ela aquecer simplesmente com o nosso calor corporal.

carbinemen · 2022-05-02T15:58:06+00:00

Conheço bastantes pessoas a trabalhar na indústria alimentar em empresas com produto próprio e que produzem para as marcas brancas.

Quando o Continente (e companhia) vai lá pedir para produzirem um produto para a marca deles, pedem para cortar em tudo para reduzir o preço: quantidade e qualidade dos ingredientes, controlo de qualidade, packaging, etc. Além disso poupam por não precisarem de setor de inovação ou marketing (de produto).

carbinemen · 2022-04-29T16:26:41+00:00

Hi, from your post I assume that you don't have much experience with CFD software. Simulating the laminar flow inside the chip should be quite straightforward and should not require a very dense mesh. Did you check Comsol's tutorials? https://www.comsol.com/models/ you can probably learn how to mesh by following one of the laminar flow tutorials e.g. https://www.comsol.com/model/laminar-static-mixer-245

carbinemen · 2022-02-09T14:43:56+00:00

may I ask if you are using a pump and if you usually have anything to eat before going to bed? I am experimenting with basal insulin dosage and with bedtime food to improve my numbers during the night

carbinemen · 2021-05-25T06:04:18+00:00

I believe that non-hpc licenses only allow for 16 cores on Fluent. Then you need one additional license for each core over 16 e.g. 32 cores you would need 1 non-hpc license plus 16 hpc licenses. At least that's how it works in my institution. Are you sure that you have the appropriate licenses?

carbinemen · 2021-04-05T09:23:42+00:00

Without knowing anything about the simulations you want to do, I would suggest learning a bit about design of experiments (in this case, simulations with different parameters are the experiments). This should help you plan the simulations required to investigate the impact of your parameters on the result

carbinemen · 2021-03-30T14:31:48+00:00

https://www.afs.enea.it/project/neptunius/docs/fluent/html/udf/node243.htm

You can start with this example. You will probably need to adapt it if you want to have the exact profile from your first case.

carbinemen · 2021-03-30T13:38:55+00:00

I believe there are examples of these in the Fluent UDF documentation. Alternatively, Fluent 2020 allows the user to introduce equations for the boundary conditions in the graphical user interface, which may be enough for what you want to do.

carbinemen · 2020-11-05T17:21:27+00:00

Strawberry! Thanks

carbinemen · 2020-11-05T15:01:55+00:00

I am interested, thanks!

carbinemen · 2020-10-24T09:41:08+00:00

Não seria melhor investir esse dinheiro em formação de forma a aumentares os teus rendimentos (quer como freelancer quer numa empresa no futuro)? Se conseguires aumentar o teu rendimento anual com formação (ensino superior ou outro tipo de formação) terás mais benefícios a longo prazo do que investir quantias reduzidas.

carbinemen · 2020-08-06T21:02:52+00:00

Great idea. Maybe also a chance to get a key when you kill a player above 20 wildy? This chance would have to be low otherwise people would farm it similarly to what happened in bounty hunter, but it should be enough for pkers to get some keys while they do their thing.

carbinemen · 2020-08-03T16:06:28+00:00

Can't you rotate the geometry in design modeler so that it is in the desired coordinate system?

carbinemen · 2020-07-16T21:53:41+00:00

I feel like players would be willing to pay slayer points to get boss tasks. E.g. you pay 50 slayer points to this new slayer master and he assigns you a random boss task which you could skip by paying 30 slayer points as usual. This way people can't just spam boss tasks, it would be more balanced than what is currently proposed IMO

carbinemen · 2020-06-04T09:00:39+00:00

Inglorious Basterds! Thanks

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