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Search took 0.00 seconds. Search: Posts Made By: selig5576
Forum: Main CFD Forum August 8, 2017, 09:48
Replies: 20
Views: 1,582
Posted By selig5576
Last question

I'm not sure if this deserves a new thread, but a quick question:

I am using Runge-Kutta for both advection and diffusion terms, and as I am using a pressure-free projection method...
Forum: Main CFD Forum August 7, 2017, 13:37
Replies: 20
Views: 1,582
Posted By selig5576
Ppe

OK, good to know. When I look at my continuity cells, they are very small, which I take as a good sign.
Forum: Main CFD Forum August 7, 2017, 11:51
Replies: 20
Views: 1,582
Posted By selig5576
Continuity

I understand that the the face velocities will form the PPE, but is what I'm doing for the continuity not right? I did some reading and found that for proper continuity, one should construct the...
Forum: Main CFD Forum August 7, 2017, 11:32
Replies: 20
Views: 1,582
Posted By selig5576
Fixed problem

Hi everyone,

thank you for the replies I believe I was able to fix my problem. So one reason why I was not getting "proper" conservation of mass is I was not using the right terms in the...
Forum: Main CFD Forum August 4, 2017, 12:52
Replies: 20
Views: 1,582
Posted By selig5576
Ppe

Hi,

I managed to "fix" the bug with my solver, so it accepts a tolerance of 1e-6.

Thank you for pointing that out, I was not aware. I am doing the discretization of the face velocities at...
Forum: Main CFD Forum August 4, 2017, 10:10
Replies: 20
Views: 1,582
Posted By selig5576
Clarification

Sorry for the unclear message I wrote the post in a rush, apologies. What I meant to say is to calculate the continuity equation I used 1st-order upwind method for the derivatives. Subsequently,...
Forum: Main CFD Forum August 3, 2017, 16:17
Replies: 20
Views: 1,582
Posted By selig5576
Pressure

After doing some testing. I deduced that for my 3D solver, after 1 time step it diverges and then starts "converging" after the second step. Checking continuity (using upwind FDM) I see that some...
Forum: Main CFD Forum August 1, 2017, 15:09
Replies: 20
Views: 1,582
Posted By selig5576
Pressure

mprinkey: My indexing is perfectly fine. What I am doing is writing a 1D array and then extracting the X,Y,Z dimensions from the 1D array, this is a very common method as having a 3D array as a 1D...
Forum: Main CFD Forum August 1, 2017, 14:50
Replies: 20
Views: 1,582
Posted By selig5576
Large pressure gradients from 3D pressure poisson equation

I have recently starting making my numerical solver 3D from 2D and I have ran into a problem when solving my PPE. For my 2D code, I have a convergent solution and pressure field never exceeds values...
Showing results 1 to 9 of 9

 
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