FAQ - Revision history

Apwillis at 13:31, 18 December 2017

2017-12-18T13:31:09Z

← Older revision		Revision as of 06:31, 18 December 2017
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	An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!		An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!
	Please [[download]] openpipeflow-1.11 or later in this case.		Please [[download]] openpipeflow-1.11 or later in this case.

			== I get error 'io_load_coll: Mp /= i_Mp' ==
			If you want to change the rotational symmetry use either [[changeMp.f90]] or [[change_Mp_alpha.f90]] utilities. The former just changes the value in the file, the latter can be used to put e.g. 3 copies of an m=3 travelling wave in an m=1 domain.

Apwillis: /* What is the spatial grid? */

2016-12-14T10:25:37Z

What is the spatial grid?

← Older revision		Revision as of 03:25, 14 December 2016
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	== What is the spatial grid? ==		== What is the spatial grid? ==
	<tt>i_N</tt> radial points are non-equispaced, bunched near the walls, and very slightly near the axis to ensure spatial accuracy where fewer points are available for the banded matrices. The points are equispaced in theta on <tt>3i_M</tt> points and in z on <tt>3i_K</tt> points. The domain has length <tt>L=2*pi/d_alpha</tt>.		<tt>i_N</tt> radial points are non-equispaced, bunched near the walls, and very slightly near the axis to ensure spatial accuracy where fewer points are available for the banded matrices. The points are equispaced in theta on <tt>3i_M</tt> points and in z on <tt>3i_K</tt> points. The domain has radius 1 and length <tt>L=2*pi/d_alpha</tt>.

	== I get 'matrix inversion error 1' ==		== I get 'matrix inversion error 1' ==
	An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!		An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!
	Please [[download]] openpipeflow-1.11 or later in this case.		Please [[download]] openpipeflow-1.11 or later in this case.

Apwillis: /* Where do I get initial conditions for a simulation? */

2016-12-14T10:24:31Z

Where do I get initial conditions for a simulation?

← Older revision		Revision as of 03:24, 14 December 2016
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	== Where do I get initial conditions for a simulation? ==		== Where do I get initial conditions for a simulation? ==
	The best initial condition is almost always to restart from a run with as similar parameters as possible.		The best initial condition is almost always to restart from a run with as similar parameters as possible.
	~~See~~ [[Database]].		Some states may be found in the [[Database]]. If you have already run some jobs, remember that their parameters are recorded in [[main.info]].

	If such a state-file is not to hand, try <tt>utils/ic.f90</tt>. Artificial initial conditions tend to suffer		If such a state-file is not to hand, try <tt>utils/ic.f90</tt>. Artificial initial conditions tend to suffer

Apwillis at 15:46, 27 June 2016

2016-06-27T15:46:49Z

← Older revision		Revision as of 08:46, 27 June 2016
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	If such a state-file is not to hand, try <tt>utils/ic.f90</tt>. Artificial initial conditions tend to suffer		If such a state-file is not to hand, try <tt>utils/ic.f90</tt>. Artificial initial conditions tend to suffer
	far greater transients. Be prepared to use smaller timesteps and possible greater resolution to overcome the transient.		far greater transients. Be prepared to use smaller timesteps and possible greater resolution to overcome the transient.


	== My job isn't starting properly, what's wrong? ==		== My job isn't starting properly, what's wrong? ==
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	== How do I select resolution? ==		== How do I select resolution? ==
	Best to start from a similar job and to check one of the spectrum files, e.g. <tt>vel_spec0010.dat</tt>. The values should fall by several orders, to approximately below <tt>1e-5</tt> in each dimension.		Best to start from a similar job and to check one of the spectrum files, e.g. <tt>vel_spec0010.dat</tt>. The values should fall by several orders, to approximately below <tt>1e-5</tt> in each dimension.


	== What is the spatial grid? ==		== What is the spatial grid? ==
	<tt>i_N</tt> radial points are non-equispaced, bunched near the walls, and very slightly near the axis to ensure spatial accuracy where fewer points are available for the banded matrices. The points are equispaced in theta on <tt>3i_M</tt> points and in z on <tt>3i_K</tt> points. The domain has length <tt>L=2.pi/d_alpha</tt>.		<tt>i_N</tt> radial points are non-equispaced, bunched near the walls, and very slightly near the axis to ensure spatial accuracy where fewer points are available for the banded matrices. The points are equispaced in theta on <tt>3i_M</tt> points and in z on <tt>3i_K</tt> points. The domain has length <tt>L=2*pi/d_alpha</tt>.

	== I get 'matrix inversion error 1' ==		== I get 'matrix inversion error 1' ==
	An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!		An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!
	Please [[download]] openpipeflow-1.11 or later in this case.		Please [[download]] openpipeflow-1.11 or later in this case.

Apwillis: /* What is the spatial grid? */

2016-06-27T15:45:50Z

What is the spatial grid?

← Older revision		Revision as of 08:45, 27 June 2016
Line 26:		Line 26:

	== What is the spatial grid? ==		== What is the spatial grid? ==
	<tt>i_N</tt> radial points are non-equispaced, bunched near the walls, and very slightly ~~so at~~ the axis to ensure spatial accuracy where fewer points are available for the banded matrices. The points are equispaced in theta on <tt>3i_M</tt> points and in z on <tt>3i_K</tt> points. The domain has length <tt>L=2.pi/d_alpha</tt>.		<tt>i_N</tt> radial points are non-equispaced, bunched near the walls, and very slightly near the axis to ensure spatial accuracy where fewer points are available for the banded matrices. The points are equispaced in theta on <tt>3i_M</tt> points and in z on <tt>3i_K</tt> points. The domain has length <tt>L=2.pi/d_alpha</tt>.


	== I get 'matrix inversion error 1' ==		== I get 'matrix inversion error 1' ==
	An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!		An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!
	Please [[download]] openpipeflow-1.11 or later in this case.		Please [[download]] openpipeflow-1.11 or later in this case.

Apwillis: /* How do I set up the libraries? */

2015-08-08T05:49:26Z

How do I set up the libraries?

← Older revision		Revision as of 22:49, 7 August 2015
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	== How do I set up the libraries? ==		== How do I set up the libraries? ==

	If you haven't already, please check out [[Getting_started#~~Compiling_libraries~~]].		If you haven't already, please check out [[Getting_started#Libraries]].

	~~Sometimes the curl library is necessary, sometimes not. Try commenting adding/commenting out -lcurl~~

			The necessity of some libraries appears to depend on distribution.
			Try commenting adding/commenting out -lcurl and/or -lblas

	== Where do I get initial conditions for a simulation? ==		== Where do I get initial conditions for a simulation? ==

Apwillis: /* I get 'matrix inversion error 1' */

2015-08-05T03:11:48Z

I get 'matrix inversion error 1'

← Older revision		Revision as of 20:11, 4 August 2015
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	== I get 'matrix inversion error 1' ==		== I get 'matrix inversion error 1' ==
	An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!		An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!
	Please ~~update to~~ openpipeflow-1.11 or later in this case.		Please [[download]] openpipeflow-1.11 or later in this case.

Apwillis: /* My job isn't starting properly, what's wrong? */

2015-08-05T03:07:08Z

My job isn't starting properly, what's wrong?

← Older revision		Revision as of 20:07, 4 August 2015
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	If you see an error from <tt>tim_check_cgce</tt>, it's likely that either an inappropriate initial condition was used, or that the resolution was inadequate.		If you see an error from <tt>tim_check_cgce</tt>, it's likely that either an inappropriate initial condition was used, or that the resolution was inadequate.

	Double-check all parameters were set correctly, ~~try <tt>less~~ main.info~~</tt>~~. If you had a similar run that worked, check which parameters have changed: try e.g. <tt>diff main.info ../job005/main.info</tt>		Double-check all parameters were set correctly, see the [[Main.info\|main.info]] file. If you had a similar run that worked, check which parameters have changed: try e.g. <tt>diff main.info ../job005/main.info</tt>


	== How do I select resolution? ==		== How do I select resolution? ==

Apwillis at 03:02, 5 August 2015

2015-08-05T03:02:18Z

← Older revision		Revision as of 20:02, 4 August 2015
Line 28:		Line 28:
	== What is the spatial grid? ==		== What is the spatial grid? ==
	<tt>i_N</tt> radial points are non-equispaced, bunched near the walls, and very slightly so at the axis to ensure spatial accuracy where fewer points are available for the banded matrices. The points are equispaced in theta on <tt>3i_M</tt> points and in z on <tt>3i_K</tt> points. The domain has length <tt>L=2.pi/d_alpha</tt>.		<tt>i_N</tt> radial points are non-equispaced, bunched near the walls, and very slightly so at the axis to ensure spatial accuracy where fewer points are available for the banded matrices. The points are equispaced in theta on <tt>3i_M</tt> points and in z on <tt>3i_K</tt> points. The domain has length <tt>L=2.pi/d_alpha</tt>.


	== I get 'matrix inversion error 1' ==		== I get 'matrix inversion error 1' ==
	An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!		An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!
	Please update to openpipeflow-1.11 or later in this case.		Please update to openpipeflow-1.11 or later in this case.

Apwillis: /* What is the spacial grid? */

2015-08-05T03:01:31Z

What is the spacial grid?

← Older revision		Revision as of 20:01, 4 August 2015
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	== What is the ~~spacial~~ grid? ==		== What is the spatial grid? ==
	<tt>i_N</tt> radial points are non-equispaced, bunched near the walls, and very slightly so at the axis to ensure spatial accuracy where fewer points are available for the banded matrices. The points are equispaced in theta on <tt>3i_M</tt> points and in z on <tt>3i_K</tt> points. The domain has length <tt>L=2.pi/d_alpha</tt>.		<tt>i_N</tt> radial points are non-equispaced, bunched near the walls, and very slightly so at the axis to ensure spatial accuracy where fewer points are available for the banded matrices. The points are equispaced in theta on <tt>3i_M</tt> points and in z on <tt>3i_K</tt> points. The domain has length <tt>L=2.pi/d_alpha</tt>.


	== I get 'matrix inversion error 1' ==		== I get 'matrix inversion error 1' ==
	An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!		An error in a #define prevented serial use with openpipeflow-1.10, which was a significant update to the double parallelisation!
	Please update to openpipeflow-1.11 or later in this case.		Please update to openpipeflow-1.11 or later in this case.