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Showing results 1 to 10 of 10 Search took 0.00 seconds. Search: Posts Made By: rks171

Forum: Main CFD Forum May 3, 2012, 09:33

Replies: 23 Timestep and Pressure Correction Relationship in SIMPLE Views: 4,218 Posted By rks171 Yes, I agree. I investigated it further, and... Yes, I agree. I investigated it further, and forcing sum of the voids to 1 is definitely accelerating the divergence, so I'm searching for the root of the problem. I did try underrelaxing the...

Forum: Main CFD Forum April 30, 2012, 16:06

Replies: 23 Timestep and Pressure Correction Relationship in SIMPLE Views: 4,218 Posted By rks171 Yes, I have the terms setup in the same way for... Yes, I have the terms setup in the same way for the momentum equation also... I didn't put my energy equation in yet because I'm still having trouble getting the "momentum -> pressure correction ->...

Forum: Main CFD Forum April 29, 2012, 12:26

Replies: 23 Timestep and Pressure Correction Relationship in SIMPLE Views: 4,218 Posted By rks171 I don't have that book right now, actually, but I... I don't have that book right now, actually, but I do have a question about this temporal term. When we discretize the temporal term in, say, the continuity equation, we get: (rho_new * alpha_new...

Forum: Main CFD Forum April 26, 2012, 08:41

Replies: 23 Timestep and Pressure Correction Relationship in SIMPLE Views: 4,218 Posted By rks171 It is a two-phase flow that I'm modeling, so... It is a two-phase flow that I'm modeling, so there is vapor in there. The vapor speed doesn't get exceedingly high, though, so I can't say it's compressible. At any rate, I do have the dx/dt * (...

Forum: Main CFD Forum April 25, 2012, 21:15

Replies: 23 Timestep and Pressure Correction Relationship in SIMPLE Views: 4,218 Posted By rks171 That's an interesting idea... does the time... That's an interesting idea... does the time contribution need to be in the pressure correction equation? I wonder if it will affect the converged pressure field solution. I'll test that out. I...

Forum: Main CFD Forum April 25, 2012, 20:33

Replies: 23 Timestep and Pressure Correction Relationship in SIMPLE Views: 4,218 Posted By rks171 Indeed, the velocity corrections are small, but... Indeed, the velocity corrections are small, but the pressure corrections change the absolute pressure in my cells. The absolute pressure is used to calculate the state properties, like density,...

Forum: Main CFD Forum April 25, 2012, 09:45

Replies: 23 Timestep and Pressure Correction Relationship in SIMPLE Views: 4,218 Posted By rks171 Yes, I'm sorry, we have. It really perplexed me,... Yes, I'm sorry, we have. It really perplexed me, though, because so often in my work, if the solution was changing too much in a timestep, the remedy was always to reduce the timestep size in order...

Forum: Main CFD Forum April 25, 2012, 08:35

Replies: 23 Timestep and Pressure Correction Relationship in SIMPLE Views: 4,218 Posted By rks171 Yes, I understand this. However, my problem... Yes, I understand this. However, my problem isn't beginning of simulation vs. end of simulation. It's the fact that if I run the simulation with a timestep size of 1E-5 seconds, then my first...

Forum: Main CFD Forum April 24, 2012, 20:35

Replies: 23 Timestep and Pressure Correction Relationship in SIMPLE Views: 4,218 Posted By rks171 Thank you for replying. I'm sorry for the long... Thank you for replying. I'm sorry for the long last post, but I was giving my reasoning for thinking this behavior was correct. But the short question would be, in the SIMPLE algorithm, if you drop...

Forum: Main CFD Forum April 24, 2012, 19:44

Replies: 23 Timestep and Pressure Correction Relationship in SIMPLE Views: 4,218 Posted By rks171 Timestep and Pressure Correction Relationship in SIMPLE I'm noticing some behavior that seems strange to me in a program I wrote that utilizes the SIMPLE algorithm. During the first iteration of the first timestep in my simulation, and due to a jump in...

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