Search found 397 matches
- Mon Jun 20, 2022 3:54 pm
- Forum: Bug reports
- Topic: Degenerate segment
- Replies: 5
- Views: 1619
Re: Degenerate segment
Dear Claudia -- Thanks for your question, and welcome to the forums. It appears that your FGONG model file has three points at the outer boundary with the same radial coordinate. This is what is causing the error. In reality, it's unlikely that the numerical model (MESA, right?) has this issue. Howe...
- Thu Jun 16, 2022 8:07 am
- Forum: Bug reports
- Topic: Failed compilation tests
- Replies: 2
- Views: 1447
Re: Failed compilation tests
Hi Valentin, and welcome to the forums! These messages are completely normal; with recent updates to the SDK, the numerical behavior of GYRE changed a small amount (on the order of 1 part in 10^15), and that led to the error messages. They are a nuisance, and I'm figuring out how to make them go awa...
- Mon May 30, 2022 8:46 am
- Forum: General Discussion
- Topic: Sign relation between damping rate and Imaginary frequency
- Replies: 12
- Views: 4372
Re: Sign relation between damping rate and Imaginary frequency
Peter --
You're absolutely right -- I can't imagine what I was thinking when I wrote my reply above. Positive Im(omega) will grow with time, and vice versa.
cheers,
Rich
You're absolutely right -- I can't imagine what I was thinking when I wrote my reply above. Positive Im(omega) will grow with time, and vice versa.
cheers,
Rich
- Sat May 28, 2022 5:09 pm
- Forum: General Discussion
- Topic: Understanding the displacement vector
- Replies: 1
- Views: 1302
Re: Understanding the displacement vector
Good question, Peter! Because Eulerian perturbations are fixed position, by definition r' = 0 and so delta r = xi_r
- Fri May 13, 2022 1:39 pm
- Forum: General Discussion
- Topic: Clarification on oscillation eqations : omega_c
- Replies: 1
- Views: 1251
Re: Clarification on oscillation eqations : omega_c
I am somewhat confused, trying to understand the oscillation equations completely. Many of them contain the term \omega_c. Is this the acoustical cutoff frequency for the model, or, as I think it might be in $GYRE_DIR/src/context/gyre_context.fpp, is it just the corotating frequency (which would th...
- Wed Apr 27, 2022 8:57 am
- Forum: General Discussion
- Topic: Sign relation between damping rate and Imaginary frequency
- Replies: 12
- Views: 4372
Re: Sign relation between damping rate and Imaginary frequency
Glad I could help -- and do send regards back to Günter!pjuelsgaard wrote: ↑Tue Apr 26, 2022 2:16 amThanks for the detailed explanation. I was having a hard time wrapping my head around it.
Also, Günter Houdek sends his regards (he's my thesis advisor)
- Mon Apr 25, 2022 10:02 am
- Forum: General Discussion
- Topic: Sign relation between damping rate and Imaginary frequency
- Replies: 12
- Views: 4372
Re: Sign relation between damping rate and Imaginary frequency
Hi Peter -- GYRE assumes a time dependence of exp(-i sigma t), where sigma is the mode angular frequency. Internally, GYRE works with the dimensionless frequency omega = sqrt(R^{3}/GM) sigma ...but the signs of sigma and omega agree. Modes with negative Im(sigma) are unstable and will grow with time...
- Mon Apr 04, 2022 12:37 pm
- Forum: Feature requests
- Topic: More helpful error messages when asking for impossible output
- Replies: 1
- Views: 2613
Re: More helpful error messages when asking for impossible output
I'd love to see stuff like this fixed, but I don't think it's worth doing until I've implemented some significant changes to how models are represented. Those changes will bring the ability to query which model data are valid.
- Wed Mar 30, 2022 10:20 am
- Forum: General Discussion
- Topic: Opacity partial deriv. definition
- Replies: 2
- Views: 1379
Re: Opacity partial deriv. definition
Hi Peter --
The opacity partials given by MESA are typically defined as dkappa/dlnT etc, whereas GYRE uses dlnkappa/dlnT. Does that explain the difference?
cheers,
Rich
The opacity partials given by MESA are typically defined as dkappa/dlnT etc, whereas GYRE uses dlnkappa/dlnT. Does that explain the difference?
cheers,
Rich
- Tue Jan 11, 2022 10:09 am
- Forum: General Discussion
- Topic: AMDL-format lacking structure coefficients c_thn
- Replies: 2
- Views: 1536
Re: AMDL-format lacking structure coefficients c_thn
Warrick is right -- AMDL files don't contain sufficient information to perform non-adiabatic calculations. Unfortunately, this means (unless the AMDL format is extended) that models created by ASTEC cannot be used for non-adiabatic studies. By the way, c_thn and other coefficients are defined here: ...