Arbeitsgruppe Kuiper - User contributions [en]

Paper policies

2025-02-03T10:01:58Z

Shaghie: Created page with "== A&A == * '''Table Captions:''' Titles should be short and placed above the table. Descriptions and references should be moved to a "Notes:" section below the table. See [https://www.aanda.org/for-authors/latex-issues/latex-examples A&A Table Guideline]s for details. * '''Titles & Headings:''' Use lowercase for all titles (main title, sections, subsections, appendices, tables), except for the first word and proper nouns. * '''Figures:''' Remove all background grids i..."

== A&A ==
* '''Table Captions:''' Titles should be short and placed above the table. Descriptions and references should be moved to a "Notes:" section below the table. See [https://www.aanda.org/for-authors/latex-issues/latex-examples A&A Table Guideline]s for details.

* '''Titles & Headings:''' Use lowercase for all titles (main title, sections, subsections, appendices, tables), except for the first word and proper nouns.

* '''Figures:''' Remove all background grids in accordance with A&A's graphic policy.

* '''Abbreviations & Acronyms:'''
** Do not start a sentence with an abbreviation. If necessary, add an article (e.g., "The NASA mission") or spell it out.
** Use e.g. and i.e. only in parentheses or figure/table legends. In the main text, use alternatives like "for example" (instead of e.g.) or "that is" (instead of i.e.). UK style does not use a comma after e.g. and i.e. (e.g. i.e.), while US style does (e.g., i.e.,).
** Always abbreviate Sect., Fig., Eq., and Col. when referring to a specific item, except at the beginning of a sentence where they should be written in full.

* '''Spell Check:''' Run a spell check based on your preferred language (US or UK English).

== nature ==

TO DO

Main Page

2025-02-03T09:41:18Z

Shaghie:

====== Herzlich willkommen zum Wiki der AG Kuiper! Welcome to the Wiki of AG Kuiper! ======

Here you find some general information and helpful links for your start in Duisburg. This is still work in progress so if you have any recommendations or improvements or want to contribute something please feel free to do so.

* [[Duisburg]]: Here you find some general information about Duisburg, moving here, finding an apartment and some tips to get started. See also the [https://www.wetter.com/hd-live-webcams/deutschland/duisburg-sportschule-wedau/5295e2f857bad/ Duisburg-Webcam]!
* [[German linguistic resources|Cherman ;) linguistic resources]]: Linguistic resources for learning the mother tongue of many German-speaking scientists
* [[University]]: All the forms and papers and websites you need for the administrative part of your work, as well as some useful links to university events.
* [[Software]]: Links to and explanations about the needed systems and software (including connecting remotely). Also includes links to useful astro resources.
* [[Hardware]]: Our computers and the clusters (computing resources) we use.
* [[Advanced Training]]: Links to training opportunities inside and outside the university
* [[Science]]: Research resources, including links to lists of conferences and meetings
* [[PhD]]: An overview of things you have to do when you start your PhD.
* [[Grants]] & Job opportunities
* The official [https://www.uni-due.de/physik/agk/ website] of the group with offices, phone numbers, and e-mail addresses.
* The group calendar is organized on the faculty's [https://nxcl.e-services.physik.uni-due.de Next-Cloud].
* [[Papers|Interesting papers]]: Sporadically updated list of papers that could be useful to several (>0) group members
* Scientific [[Projects]]
* Different [[paper policies]]
----
* [[Arbeitsschutz]]
* [[Imperia]]
* [[Wiki-Hilfe]]

Windtunnel/Boundary Conditions

2024-10-22T13:51:29Z

Shaghie: /* Object */

[[Windtunnel online|up]]

= New Keywords =

== in pluto.ini ==

* <code>ObjectType_int</code>: 0=nothing, 1=cylinder/sphere, 2=square/cube of size <code>ObjectDiameter_cm</code>
* <code>WindPressure_Pa</code>, <code>WindPressure_mbar</code> (mutually exclusive): pressure at entry (left)
* <code>PressureGradient_mbar_per_cm</code> positive (even though pressure drops from left to right)
* Wind velocity is ramped up to <code>WindVelocity_m_per_s</code> over time <code>InjectionTime_s</code>
* <code>WindTemperature_C</code>
* <code>KinematicViscosity_m2_per_s</code>, <code>DynamicViscosity_Pa_s</code>,
* <code>Wall_BoundaryCondition</code> for tangential walls, value from {0,1,2,3}

(ignored if given values <0)

== in init.c ==

* macro <code>SOLID</code> to enable an object
* array <code>solid</code> containing value 1 or 0 for object matter being present/absent

= Walls =
[[File:WT- Boundary Condition Skizze.jpg|thumb]]

== tangential ==

{| class="wikitable" id="ganz_oben"
|+ id="Ü-id" |
|- id="K-id"
!colspan="3"| Boundary condition for the wall
|- id="Sprungziel1"
| || vx1 || vx2
|-
| no-shear || zero-gradient || reflective
|-
| no-slip || reflective || reflective
|-
| no-wall || zero-gradient || zero-gradient
|-
| one-way wall || zero-gradient || zero-gradient & no-inflow
|}

== entry/exit ==

=== prescribed velocity at entry (left) ===

=== prescribe pressure drop (left to right) ===

* current simulation result: $v_x$-profile slightly asymmetric and $v_x<0$ at one wall

= Object =

* Strong asymmetry when driven by pressure gradient. Bug!
[[File:Asymmetry.png|thumb|It shows that vx2 is not symmetric to the y=0 axis.]]
* At the boundary of a region which has <code>FLAG_INTERNAL_BOUNDARY</code> set, '''no''' boundary conditions are specified.

= Open Questions =

== Reflective cells ==

Setting the vector $\vec v_g$ in a ghost cell as $\vec v_g=-\vec v$, with $\vec v$ being the value in the adjacent real cell, yields $\vec 0$ as interpolation right at the boundary. This works for plane walls. What to do in cases where a ghost cell has more than one real cell as nearest neighbor? This calls for [[Talk:Windtunnel/Boundary_Conditions|discussion]]!

= Analytical Solutions =

== empty 2D channel ==

$$
v_x(y) = \frac{\Delta p}{L}\frac{D^2/4-y^2}{2\mu}
$$

== empty circular tube ==

$$
v_z(r) = \frac{\Delta p}{L}\frac{R^2-r^2}{4\mu}
$$

with $\mu$=dynamical viscosity

File:Asymmetry.png

2024-10-22T13:50:29Z

Shaghie:

It shows the vx2 is not symmetric for the y=0 axis.

Windtunnel online

2024-09-09T13:06:02Z

Shaghie:

vom [https://www.uni-due.de/zhqe/foerderprogr_lehr-lern-inno.php LLI-Programm] gefördertes Projekt „Windkanal Online“

= Ziele =

# belt/PLUTO kann alle relevanten [[Windtunnel/Boundary Conditions|Randbedingungen]] rechnen.
# belt/PLUTO erzeugt einen großen Datensatz an Ergebnissen (Felder) für verschiedene Parameter
# Ein [[Windkanal/GUI|GUI]] (''streamlit''?) kann die Datensätze interaktiv darstellen.
# Integration des GUIs in Moodle

= TODO =

* Modifikation von belt/PLUTO und Tests der Modifikationen:
** Tests der Randbedingungen für die Wände
** Tests der Randbedingungen am angeströmten Objekt
* Geeignetes GUI finden, [https://h5p.org H5P] ist schon in Moodle integriert.

= Boundary condition for the wall =
[[File:WT- Boundary Condition Skizze.jpg|thumb]]
{| class="wikitable" id="ganz_oben"
|+ id="Ü-id" |
|- id="K-id"
!colspan="3"| Boundary condition for the wall
|- id="Sprungziel1"
| || vx1 || vx2
|-
| no-shear || zero-gradient || reflective
|-
| no-slip || reflective || reflective
|-
| no-wall || zero-gradient || zero-gradient
|-
| one-way wall || zero-gradient || zero-gradient & no-inflow
|}

= Boundary condition for the object =

Windtunnel online

2024-09-09T12:28:20Z

Shaghie:

vom [https://www.uni-due.de/zhqe/foerderprogr_lehr-lern-inno.php LLI-Programm] gefördertes Projekt „Windkanal Online“

= Ziele =

# belt/PLUTO kann alle relevanten [[Windtunnel/Boundary Conditions|Randbedingungen]] rechnen.
# belt/PLUTO erzeugt einen großen Datensatz an Ergebnissen (Felder) für verschiedene Parameter
# Ein [[Windkanal/GUI|GUI]] (''streamlit''?) kann die Datensätze interaktiv darstellen.
# Integration des GUIs in Moodle

= TODO =

* Modifikation von belt/PLUTO und Tests der Modifikationen:
** Tests der Randbedingungen für die Wände
** Tests der Randbedingungen am angeströmten Objekt
* Geeignetes GUI finden, [https://h5p.org H5P] ist schon in Moodle integriert.

= Boundary condition for the wall =
# no-shear
# open & no-slip
# no-wall
# one-way wall
[[File:WT- Boundary Condition Skizze.jpg|thumb]]

= Boundary condition for the object =

File:WT- Boundary Condition Skizze.jpg

2024-09-09T12:27:51Z

Shaghie: Shaghie moved page File:Boundary Condition Skizze.jpg to File:WT- Boundary Condition Skizze.jpg

Boundary Condition for the wall

File:WT- Boundary Condition Skizze.jpg

2024-09-09T12:24:55Z

Shaghie:

Boundary Condition for the wall

File:WT-No-slip-wall-Without-object.gif

2024-09-04T08:08:53Z

Shaghie: Shaghie moved page File:No-slip.gif to File:WT-No-slip-wall-Without-object.gif

no-slip wall

File:WT-No-slip-wall-Without-object.gif

2024-09-04T07:20:12Z

Shaghie:

no-slip wall

Software

2024-07-18T09:55:08Z

Shaghie: /* Network & Collaboration */

= Science =

== Astro stuff ==

* [https://git.uni-due.de/agkuiper/belt Belt] (which needs [[PETSc]]): Rolf's PLUTO version ([[compile-belt|manual]] for compiling)
** [[Restarting belt automatically]]
** [[Scaling tests]] (for belt)
* [[Visit]] Tips and tricks
* [[pyPLUTO]]: a Python module to read and analyse PLUTO output

== Online Tools ==

* a nice, free [https://www.geogebra.org/3d 3D-plotter] (in cases when Mathematica is somehow unavailable)

== Other ==

* avoiding O(''N''²) for long range interactions:
** [http://www.scafacos.de ScaFaCoS]
** [https://www.ks.uiuc.edu/Research/msm/details.html Multilevel Summation Method]

= Network & Collaboration =

* [[VPN]]
* [[SSH and SCP]]
* [[Two-Factor Authentification]] (2FA)
* University [[Git#GitLab|GitLab]] (https://git.uni-due.de)
* [https://uni-due.zoom.us/profile University Zoom]
* [https://nxcl.e-services.physik.uni-due.de University Nextcloud]: This is where we have the group calendar as well! [[Hier]] How to sync the Nextcloud calendar with your iphone/ipad?

= Publishing =

* [https://www.uni-due.de/zim/services/software/office-ma.php MS Office] for faculty members. Note that [https://www.libreoffice.org/ LibreOffice] (Windows, Linux; use package manager) is an excellent and free alternative but ''caveat emptor'' about some formatting incompatibilities.
* [[Zotero]]
* making bibliographies compact (e.g. for proposals): https://github.com/lmytime/tex_compact_bib

Software

2024-07-18T09:53:37Z

Shaghie: /* Network & Collaboration */

= Science =

== Astro stuff ==

* [https://git.uni-due.de/agkuiper/belt Belt] (which needs [[PETSc]]): Rolf's PLUTO version ([[compile-belt|manual]] for compiling)
** [[Restarting belt automatically]]
** [[Scaling tests]] (for belt)
* [[Visit]] Tips and tricks
* [[pyPLUTO]]: a Python module to read and analyse PLUTO output

== Online Tools ==

* a nice, free [https://www.geogebra.org/3d 3D-plotter] (in cases when Mathematica is somehow unavailable)

== Other ==

* avoiding O(''N''²) for long range interactions:
** [http://www.scafacos.de ScaFaCoS]
** [https://www.ks.uiuc.edu/Research/msm/details.html Multilevel Summation Method]

= Network & Collaboration =

* [[VPN]]
* [[SSH and SCP]]
* [[Two-Factor Authentification]] (2FA)
* University [[Git#GitLab|GitLab]] (https://git.uni-due.de)
* [https://uni-due.zoom.us/profile University Zoom]
* [https://nxcl.e-services.physik.uni-due.de University Nextcloud]: This is where we have the group calendar as well! [[sync nextcloud calendar with your iphone]]

= Publishing =

* [https://www.uni-due.de/zim/services/software/office-ma.php MS Office] for faculty members. Note that [https://www.libreoffice.org/ LibreOffice] (Windows, Linux; use package manager) is an excellent and free alternative but ''caveat emptor'' about some formatting incompatibilities.
* [[Zotero]]
* making bibliographies compact (e.g. for proposals): https://github.com/lmytime/tex_compact_bib

NextCloud-calendar in iOS

2024-07-18T09:51:36Z

Shaghie: Created page with "1. Find the CalDAV URL in Nextcloud: *Log into your Nextcloud *Navigate to the Calendar app *Click on the settings icon *Look for the "CalDAV link" and copy the URL 2. Add the CalDAV Account to Your iPhone: *Open the Settings app on your iPhone *Navigate to the Calendar *Tap on Add Account *Select Other *Under the Calendars section, tap on Add CalDAV Account 3. Add a new device to Nextcloud: *Log into your Nextcloud *Navigate to security *Create a new app password 4..."

1. Find the CalDAV URL in Nextcloud:
*Log into your Nextcloud
*Navigate to the Calendar app
*Click on the settings icon
*Look for the "CalDAV link" and copy the URL

2. Add the CalDAV Account to Your iPhone:
*Open the Settings app on your iPhone
*Navigate to the Calendar
*Tap on Add Account
*Select Other
*Under the Calendars section, tap on Add CalDAV Account

3. Add a new device to Nextcloud:
*Log into your Nextcloud
*Navigate to security
*Create a new app password

4. Enter the CalDAV Account Information:
*In the Server field, enter the CalDAV URL you copied from Nextcloud
*User Name: your Nextcloud username
*Password: your new password
*Description: whatever you want

Software

2024-07-18T09:38:52Z

Shaghie: /* Network & Collaboration */

= Science =

== Astro stuff ==

* [https://git.uni-due.de/agkuiper/belt Belt] (which needs [[PETSc]]): Rolf's PLUTO version ([[compile-belt|manual]] for compiling)
** [[Restarting belt automatically]]
** [[Scaling tests]] (for belt)
* [[Visit]] Tips and tricks
* [[pyPLUTO]]: a Python module to read and analyse PLUTO output

== Online Tools ==

* a nice, free [https://www.geogebra.org/3d 3D-plotter] (in cases when Mathematica is somehow unavailable)

== Other ==

* avoiding O(''N''²) for long range interactions:
** [http://www.scafacos.de ScaFaCoS]
** [https://www.ks.uiuc.edu/Research/msm/details.html Multilevel Summation Method]

= Network & Collaboration =

* [[VPN]]
* [[SSH and SCP]]
* [[Two-Factor Authentification]] (2FA)
* University [[Git#GitLab|GitLab]] (https://git.uni-due.de)
* [https://uni-due.zoom.us/profile University Zoom]
* [https://nxcl.e-services.physik.uni-due.de University Nextcloud]: This is where we have the group calendar as well! [[Hier]] How to sync the nextcloud calendar with your iphone/ipad.

= Publishing =

* [https://www.uni-due.de/zim/services/software/office-ma.php MS Office] for faculty members. Note that [https://www.libreoffice.org/ LibreOffice] (Windows, Linux; use package manager) is an excellent and free alternative but ''caveat emptor'' about some formatting incompatibilities.
* [[Zotero]]
* making bibliographies compact (e.g. for proposals): https://github.com/lmytime/tex_compact_bib

Windtunnel online

2024-06-28T07:41:58Z

Shaghie:

vom [https://www.uni-due.de/zhqe/foerderprogr_lehr-lern-inno.php LLI-Programm] gefördertes Projekt „Windkanal Online“

= Ziele =

# belt/PLUTO kann alle relevanten [[Windtunnel/Boundary Conditions|Randbedingungen]] rechnen.
# belt/PLUTO erzeugt einen großen Datensatz an Ergebnissen (Felder) für verschiedene Parameter
# Ein [[Windkanal/GUI|GUI]] (''streamlit''?) kann die Datensätze interaktiv darstellen.
# Integration des GUIs in Moodle

= TODO =

* Modifikation von belt/PLUTO und Tests der Modifikationen:
** Tests der Randbedingungen für die Wände
** Tests der Randbedingungen am angeströmten Objekt
* Geeignetes GUI finden, [https://h5p.org H5P] ist schon in Moodle integriert.

= Boundary condition for the wall =
# no-shear
# open & no-slip
# no-wall
# one-way wall

= Boundary condition for the object =

Talk:Windtunnel online

2024-06-05T09:25:01Z

Shaghie: Created page with "I ran the simulations for two different pressures. In both cases, I couldn't see the object. In my version, the solid is included. @Dennis also ran the simulation, but he didn't have the solid, so he re-wrote '''init.c'''. The object appeared in his simulation. Density plot I tried to run the exact same simulation as Dennis, but there was still no object, just like before."

I ran the simulations for two different pressures. In both cases, I couldn't see the object. In my version, the solid is included.
@Dennis also ran the simulation, but he didn't have the solid, so he re-wrote '''init.c'''. The object appeared in his simulation.
[[File:Density plot.png|thumb|Density plot]]
I tried to run the exact same simulation as Dennis, but there was still no object, just like before.

File:WT Density plot.png

2024-06-05T09:24:26Z

Shaghie:

Density plot for p= 1e+1mbar