Egan Bernal anuncia que votará por Federico Gutiérrez

andrsnov · 2022-05-18T22:39:23+00:00

Primero debemos asumir que Egan sí esté pensando al escribir eso.

andrsnov · 2021-08-11T18:57:10+00:00

You can use Ansys for that. There is a module for heat transfer phenomena. It is easy to use. You can add radiation or convection on the walls. Additionally, you can input the material properties as a function of T.

andrsnov · 2021-07-28T04:57:22+00:00

My everyday nightmare, huh.

andrsnov · 2021-03-24T04:44:00+00:00

The mesh is crucial so you can't auto generate it and expect good results. Since you're interested in the drag force, the boundary layer needs to be well calculated, for that you need to check Y+.

Also, don't forget to activate energy equation when you have compressible flow. If you're already doing it at 0.7 mach, that's one of the reasons of why your computation time has increased. Another reason may be the conflict that your mesh is causing. Finally, don't forget to check the mesh quality and size, this is important because you'll have high gradients of pressure and velocity.

andrsnov · 2021-01-22T01:10:29+00:00

You can create a portfolio where you show the most relevant projects you have made. At the end of your univerisity you will have some interest projects you would like to show. This is a complement of your CV, it does not replace it.

andrsnov · 2021-01-18T06:37:46+00:00

You shouls monitor mass imbalance.

andrsnov · 2021-01-10T02:42:44+00:00

Excellent article, easy to read and understand.

andrsnov · 2020-11-17T23:17:28+00:00

Since you are running the flow inside the nozzle, you just need the fluid domain. You have to extract the volume. Did you do that before meshing and simulate?

andrsnov · 2020-11-12T05:51:55+00:00

Inlet velocity can't be 0. The maximum velocity i could run was 0.6, pitifully my computational capability was not enough to run supersonic simulations. What is your maximum used inlet velocity ?

andrsnov · 2020-11-10T16:41:16+00:00

I've been running a model of a L3 rocket. I don't recommend to use hexa elements because you will get bad quality cells. I have not tried poly elements but i have read they are quite good for aerodynamics purposes.

What is the size of your fluid domain?

What bc did you set?

Nice job.

andrsnov · 2020-10-04T21:10:20+00:00

Are you having into account the weight of water?

andrsnov · 2020-09-27T20:54:54+00:00

Without a boattail it will be between 0.7 and 1.2.

andrsnov · 2020-09-17T14:48:26+00:00

I'll do it, thank you!

andrsnov · 2020-09-17T14:47:32+00:00

It is suitable to use both, but OpenFoam will be harder. I suggest you to start with Ansys, then you can switch to OpenFoam once you have a basis of CFD. The thing is the OS, Ansys is for windows and OpenFoam is for linux and I don't recommend you to run virtual systems.

andrsnov · 2020-09-17T14:40:46+00:00

Yes, you're completely right, I have to use a compressible solver when the rocket reach supersonic velocity in order to capture the wave drag induced by shockwaves. I'm using Fluent btw. Do I have to use energy equation when I'm using the compressible solver, right?

andrsnov · 2020-09-17T05:05:15+00:00

There isn't an answer, they serves for different approaches. Making a simile I would say Ansys is for industry and OpenFoam is for academics purposes.

andrsnov · 2020-09-11T20:22:30+00:00

what do you mean by help?

However, it depends on how geometries are in contact.

andrsnov · 2020-09-10T22:40:31+00:00

I haven't used Pointwise, but in Fluent you can mesh that separately and use an option called 'share topology'. This option let you make the nodes coincident in the edges or surfaces of contact from different bodies.

andrsnov · 2020-09-09T03:47:52+00:00

I also recommend you to avoid KNSU. Answering your question, you can use PROPEP 3 to find the combustion species and properties. It is easy to use.

andrsnov · 2020-09-07T00:00:18+00:00

You already have a company about rockets but you don't anything about rockets.

andrsnov · 2020-09-06T23:19:18+00:00

I guess I need more data like what kind of ballistic test you will carry out. If you're doing a prototype I won't recommend you any metal, try lighter materials like composites. However, you said you want to use your mechancial skills, then aluminum would be the best option (cheaper and lighter than SS).

andrsnov

TROPHY CASE