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Showing results 1 to 25 of 1836 Search took 0.07 seconds. Search: Posts Made By: sbaffini

Forum: Main CFD Forum August 9, 2022, 09:01

Replies: 8 On the pressure inlet BC Views: 158 Posted By sbaffini Thanks, I have indeed also tried several... Thanks, I have indeed also tried several combinations (note however that I cannot work with sound speed or density in my code, as preconditioning and my choice of independent variables makes them...

Forum: Main CFD Forum August 9, 2022, 05:47

Replies: 8 On the pressure inlet BC Views: 158 Posted By sbaffini I probably misguided you by using a Fluent based... I probably misguided you by using a Fluent based nomenclature. What I am referring to is, exactly, a total pressure bc. That is, I know total pressure P0 and total temperature T0 at inlet. How do...

Forum: Main CFD Forum August 8, 2022, 12:56

Replies: 8 On the pressure inlet BC Views: 158 Posted By sbaffini On the pressure inlet BC Dear all, I have a doubt about how a correct pressure inlet bc should be implemented and would like to hear from anyone who has coded this. Let's first clarify that I'm talking about this...

Forum: Main CFD Forum August 8, 2022, 10:46

Replies: 5 can we use final convergence residuals for regression testing of our code? Views: 172 Posted By sbaffini Let's supersede the fact that NO, it is not ok... Let's supersede the fact that NO, it is not ok for the unsteady residuals to show unpredictable behavior. Even if you were performing DNS, as long as done with the same code on the same machine and...

Forum: Main CFD Forum August 5, 2022, 05:06

Replies: 17 Panel-Method, velocity calculation Views: 950 Posted By sbaffini Thanks for the clarification. To give some... Thanks for the clarification. To give some context on why I used this method, consider that this was my first ever panel code, made for a university course. Back then, I just tought that I...

Forum: Main CFD Forum August 4, 2022, 14:45

Replies: 17 Panel-Method, velocity calculation Views: 950 Posted By sbaffini Dear James, I see what you mean, but I have a... Dear James, I see what you mean, but I have a doubt. From what you say, I understand that in the source-doublet method with Dirichlet boundary conditions on the potential, using the local gradient...

Forum: Main CFD Forum August 4, 2022, 11:23

Replies: 3 Different results with scaled up version of simple grid Views: 103 Posted By sbaffini Well, the problems might be everywhere (are... Well, the problems might be everywhere (are meshes identical except for a scale factor?), but in general you clearly aren't solving two identical problems, and the fact that you only refer about...

Forum: Main CFD Forum August 4, 2022, 10:24

Replies: 17 Panel-Method, velocity calculation Views: 950 Posted By sbaffini I can only speak for the vortex ring case but,... I can only speak for the vortex ring case but, few things are worth mentioning, as I don't know exactly how this translate to other approaches: 1) The issue for this method is just about the...

Forum: Main CFD Forum August 4, 2022, 07:59

Replies: 4 High order relaxation Views: 127 Posted By sbaffini I haven't coded it myself, nor I use deferred... I haven't coded it myself, nor I use deferred correction in the form typically presented (I use a density based solver in delta form), but the overall effect is indeed similar to the gradient...

Forum: Main CFD Forum August 4, 2022, 07:47

Replies: 17 Panel-Method, velocity calculation Views: 950 Posted By sbaffini My direct experience is only with a 3D vortex... My direct experience is only with a 3D vortex ring method, which however is equivalent to a constant doublet one. In my case I had to add a surface gradient contribution, which I took from a slide of...

Forum: Main CFD Forum August 3, 2022, 12:33

Replies: 4 High order relaxation Views: 127 Posted By sbaffini phi_intermediate is the value that phi would have... phi_intermediate is the value that phi would have taken if relaxation was not present. The explanation in the manual is not extra clear, but the idea is that the factor f multiplies the so called...

Forum: Main CFD Forum August 3, 2022, 11:22

Replies: 1 Wierd looking velocity contour for DrivAer external airflow simulation Views: 87 Posted By sbaffini I remember having similar issues (a decade ago),... I remember having similar issues (a decade ago), which are related to the parallel decomposition, but I honestly don't remember anymore when and why this happened, if it was my fault or Fluent fault,...

Forum: Fluent UDF and Scheme Programming August 3, 2022, 09:58

Replies: 16 Udm value on the walls Views: 806 Posted By sbaffini No, I mean the part that I reported in my... No, I mean the part that I reported in my previous post: "Note: Note that all boundary conditions used by the MHD model must be set in the Boundary Condition tab of the MHD Model dialog box....

Forum: Fluent UDF and Scheme Programming August 3, 2022, 09:23

Replies: 16 Udm value on the walls Views: 806 Posted By sbaffini I took some time and checked better. Two things: ... I took some time and checked better. Two things: 1) Apparently, MHD module in Fluent is still based on UDF and UDS, so your findings seems coherent with the fact that MHD is based on UDS. 2)...

Forum: Fluent UDF and Scheme Programming August 3, 2022, 08:10

Replies: 16 Udm value on the walls Views: 806 Posted By sbaffini Ok, you certainly don't need a define_adjust to... Ok, you certainly don't need a define_adjust to simply assign a sinusoidal time variation to a BC. As I said, it is meant for other things. Now, your scenario is very simple, and there certainly...

Forum: Fluent UDF and Scheme Programming August 3, 2022, 07:33

Replies: 16 Udm value on the walls Views: 806 Posted By sbaffini Not sure I understand, nor I will be able to... Not sure I understand, nor I will be able to check or help with any code now. But, you need to know the following, define_adjust is called at the beginning of each iteration and it is general,...

Forum: Main CFD Forum August 2, 2022, 08:38

Replies: 2 Example code for 2D linear convection on unstructured triangular grids Views: 119 Posted By sbaffini What is your difficulty? Because, in general, it... What is your difficulty? Because, in general, it really sums up to simply not using the diffusion part from the convection-diffusion example. For explicit schemes, of course, there are caveats,...

Forum: Main CFD Forum August 1, 2022, 16:46

Replies: 37 How to chose source and doublet source terms 3D panel method Views: 435 Posted By sbaffini Dear James, I have to tell that the last... Dear James, I have to tell that the last time I worked on this topic is around 16 years ago, when I was actually trying to make a 3D, vortex rings only, panel method for closed and open bodies,...

Forum: Main CFD Forum August 1, 2022, 07:11

Replies: 37 How to chose source and doublet source terms 3D panel method Views: 435 Posted By sbaffini Apologies again if my intervention seemed out of... Apologies again if my intervention seemed out of place or contentious, the questions in my last answer were genuine. I want to understand what you two are saying because, now, I don't understand. ...

Forum: Main CFD Forum July 31, 2022, 03:57

Replies: 37 How to chose source and doublet source terms 3D panel method Views: 435 Posted By sbaffini Ok, again apologies for the confusion, but Katz... Ok, again apologies for the confusion, but Katz and Plotkin describe exactly this approach in the first 4 paragraphs of chapter 9. They even mention issues when the body gets too thin. So, is that...

Forum: Main CFD Forum July 30, 2022, 18:41

Replies: 3 modeling options for conjugate heat transfer at porous-wall interface Views: 124 Posted By sbaffini Betchen, straatman and de groot seem to have... Betchen, straatman and de groot seem to have worked more extensively on the subject, so their work might be a more reliable source. Yet, I have no idea of the fundamentals on the topic

Forum: Main CFD Forum July 30, 2022, 09:12

Replies: 37 How to chose source and doublet source terms 3D panel method Views: 435 Posted By sbaffini Apologies if I make confusion over the comments... Apologies if I make confusion over the comments of people knowing better than me but, maybe, what you miss is that a single source is just assigned to balance the local Vinf*n term. That is, all the...

Forum: Main CFD Forum July 30, 2022, 09:04

Replies: 3 modeling options for conjugate heat transfer at porous-wall interface Views: 124 Posted By sbaffini I haven't worked yet on it, but this work does... I haven't worked yet on it, but this work does that and includes additional references on the topic ...

Forum: Main CFD Forum July 28, 2022, 05:26

Replies: 3 Get velocity values of adjacent cells Views: 140 Posted By sbaffini The problem you have could be anything, even non... The problem you have could be anything, even non UDF related. Probably it is some floating point exception in one process, or you are using some variable which is not initialized correctly....

Forum: Main CFD Forum July 27, 2022, 10:58

Replies: 9 Fast Fluid Dynamics - Pressure Field Views: 160 Posted By sbaffini The point is that this kinda means nothing in... The point is that this kinda means nothing in quantitative terms. Have you ever seen how rubbish a first order solution can look while still being quite there in terms of formal accuracy? So, in...

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