slow convergence gpyro_0.700

[Alexandra.D]

Hello guys, 

I was creating a heat transfer and pyrolysis model on gpyro_0.8186 but it takes a long time to converge and run. It was suggested that I move to gpyro_0.700 however, I am having the same problem that it takes a very long time to run and converge for temperature. I was wondering if someone could take a look at my code and see if they can find any faults that could be causing this? I have been trying for a while now and I cannot find the solution!

Thank you, 

Alexandra 

[Rein, Guillermo]

Hi Alexandra,

Can you quantify what you mean by “too long”? It means different things to each person.

Cheers,

G.

Prof Guillermo Rein, Imperial Hazelab

http://www.imperial.ac.uk/hazelab

On 25 Feb 2020, at 13:18, Alexandra.D <Alexandra...@gmail.com> wrote:



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<Gpyro code V P + HT old.xls>

[Alexandra.D]

So the model is set to run for 150 seconds but because the values for temperature are failing to converge as it runs the time step gets very small. If I remember correctly last time I ran it it took about 10 - 15 minutes to complete. This is longer than it took to run in Gpyro_0.8 and since I was told this wouldn't be the case I assumed I must have implemented something wrong in the older version.... however I cannot find the error! 

On Tuesday, 25 February 2020 18:42:57 UTC, g.rein wrote:

Hi Alexandra,

Can you quantify what you mean by “too long”? It means different things to each person.

Cheers,

G.

Prof Guillermo Rein, Imperial Hazelab

http://www.imperial.ac.uk/hazelab

On 25 Feb 2020, at 13:18, Alexandra.D <Alexandra...@gmail.com> wrote:



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Hello guys, 

I was creating a heat transfer and pyrolysis model on gpyro_0.8186 but it takes a long time to converge and run. It was suggested that I move to gpyro_0.700 however, I am having the same problem that it takes a very long time to run and converge for temperature. I was wondering if someone could take a look at my code and see if they can find any faults that could be causing this? I have been trying for a while now and I cannot find the solution!

Thank you, 

Alexandra 

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[Davood Zeinali]

This most likely has to do with the relaxation routine trying to prevent divergence, resulting in longer calculation times as the time-step shrinks. This is done automatically, but the option was removed in some older versions:

http://reaxfire.com/trac/gpyro/ticket/8

Cheers,

Dave

On Tue, Feb 25, 2020 at 8:32 PM Alexandra.D <Alexandra...@gmail.com> wrote:

So the model is set to run for 150 seconds but because the values for temperature are failing to converge as it runs the time step gets very small. If I remember correctly last time I ran it it took about 10 - 15 minutes to complete. This is longer than it took to run in Gpyro_0.8 and since I was told this wouldn't be the case I assumed I must have implemented something wrong in the older version.... however I cannot find the error! 

On Tuesday, 25 February 2020 18:42:57 UTC, g.rein wrote:

Hi Alexandra,

Can you quantify what you mean by “too long”? It means different things to each person.

Cheers,

G.

Prof Guillermo Rein, Imperial Hazelab

http://www.imperial.ac.uk/hazelab

On 25 Feb 2020, at 13:18, Alexandra.D <Alexandra...@gmail.com> wrote:



This email from Alexandra...@gmail.com originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list to disable email stamping for this address.

 

Hello guys, 

I was creating a heat transfer and pyrolysis model on gpyro_0.8186 but it takes a long time to converge and run. It was suggested that I move to gpyro_0.700 however, I am having the same problem that it takes a very long time to run and converge for temperature. I was wondering if someone could take a look at my code and see if they can find any faults that could be causing this? I have been trying for a while now and I cannot find the solution!

Thank you, 

Alexandra 

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<Gpyro code V P + HT old.xls>

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[Han Yuan]

Sometimes, It really gets slow in the new version. I'll take another look. Can it run to completion right now using V0.8 ? 10-15 minutes for a case is acceptable in the Gpyro V0.8.

For old version, Franz would have some experience.

在 2020年2月25日星期二 UTC下午7:32:42，Alexandra.D写道：