COMSOL Exchange
http://www.comsol.com/community/exchange/
Receive updates on user-generated models in COMSOL ExchangeThu, 11 Jun 2015 02:38:38 +0000COMSOL Exchangehttp://www.comsol.com/shared/images/logos/comsol_logo.gif
http://www.comsol.com/community/exchange/
Tutorial models for COMSOL Webinar "Simulating Graphene-Based Photonic and Optoelectronic Devices"
http://feedproxy.google.com/~r/ComsolExchange/~3/lv3ghww-nVA/
Basic tutorial models for COMSOL Webinar<br />
"Simulating Graphene-Based Photonic and Optoelectronic Devices" <br />
by Prof. Alexander Kildishev, Purdue University, USA<br />
Validation with a meshless method performed by <br />
Dr. Lucie Prokopeva, Novosibirsk University, Russia<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/lv3ghww-nVA" height="1" width="1" alt=""/>Thu, 11 Jun 2015 02:38:38 +00003.1433990318.361http://www.comsol.com/community/exchange/361/It is very interesting.
http://feedproxy.google.com/~r/ComsolExchange/~3/j3ar_hutrhE/
It is very interesting.<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/j3ar_hutrhE" height="1" width="1" alt=""/>Sun, 31 May 2015 18:08:49 +00003.1433095729.351http://www.comsol.com/community/exchange/351/Material: Water H2O
http://feedproxy.google.com/~r/ComsolExchange/~3/DXbJKkq793o/
Just open and save material to your own User-Defined Library, or copy the Interpolations to your own material. <br />
<br />
Hale and Querry 1973- Water; n,k 0.2-200 µm; 25 °C<br />
<br />
Data from: http://refractiveindex.info/?shelf=main&book=H2O&page=Hale<br />
<br />
Original data from:G. M. Hale and M. R. Querry. Optical Constants of Water in the 200-nm to 200-µm Wavelength Region, Appl. Opt. 12, 555-563 (1973)<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/DXbJKkq793o" height="1" width="1" alt=""/>Wed, 20 May 2015 10:08:21 +00003.1432116501.281http://www.comsol.com/community/exchange/281/Material: Fused Silica with sellmeier refractive index
http://feedproxy.google.com/~r/ComsolExchange/~3/fQ-Dx0suwPE/
Material Fused Silica, just open and save material to your own User-Defined Library, or copy the equation to your own material.<br />
<br />
<br />
Refractive index data (0.21-3.71 µm) based on Sellmeier equation from: H. Malitson. Interspecimen Comparison of the Refractive Index of Fused Silica, J. Opt. Soc. Am. 55, 1205-1208 (1965).<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/fQ-Dx0suwPE" height="1" width="1" alt=""/>Wed, 20 May 2015 10:08:04 +00003.1432116484.271http://www.comsol.com/community/exchange/271/Material: Cr with Refractive index
http://feedproxy.google.com/~r/ComsolExchange/~3/SCsYxNkQpbo/
Data from: <br />
http://refractiveindex.info/?shelf=main&book=Cr&page=Rakic<br />
Original data:<br />
A. D. Rakić, A. B. Djurišic, J. M. Elazar, and M. L. Majewski. Optical properties of metallic films for vertical-cavity optoelectronic devices, Appl. Opt. 37, 5271-5283 (1998)<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/SCsYxNkQpbo" height="1" width="1" alt=""/>Wed, 20 May 2015 10:07:37 +00003.1432116457.341http://www.comsol.com/community/exchange/341/Allen-Cahn (nonlinear reaction diffusion) Equation
http://feedproxy.google.com/~r/ComsolExchange/~3/HkxHCsAPffo/
The Allen–Cahn equation ( John W. Cahn and Sam Allen) is a nonlinear reaction-diffusion equation of mathematical physics which describes the process of phase separation in iron alloys including order-disorder transitions.<br />
The partial differential equation<br />
$\frac{\partial u}{\partial t} = \epsilon \Delta u + F(u)$<br />
where $F(u)$is the free energy density and<br />
$F(u) = u(1-u)(u-\frac{1}{2}+0.1)$.<br />
By using the Heat Equation in Mathmatica Branch, we add the free energy density as a source term.<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/HkxHCsAPffo" height="1" width="1" alt=""/>Tue, 28 Apr 2015 12:25:34 +00003.1430223934.331http://www.comsol.com/community/exchange/331/2D modelling P-, S-, R-waves in geomassif (35a)
http://feedproxy.google.com/~r/ComsolExchange/~3/S5H8_Fn7kGI/
2G modelling P-, S-, R-waves in geomassif<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/S5H8_Fn7kGI" height="1" width="1" alt=""/>Wed, 15 Apr 2015 06:50:39 +00003.1429080639.239http://www.comsol.com/community/exchange/239/Magnets attract each other
http://feedproxy.google.com/~r/ComsolExchange/~3/gYAYvswLNrQ/
Magnets attract each other，it is very interesting!<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/gYAYvswLNrQ" height="1" width="1" alt=""/>Sun, 12 Apr 2015 16:37:20 +00003.1428856640.321http://www.comsol.com/community/exchange/321/2D wave equation
http://feedproxy.google.com/~r/ComsolExchange/~3/Hz-fCMqdess/
This is a simple model for beginners. <br />
2D waves equations is solved on a rectangular region. An exponential (2D) perturbation is generated in the centre of the study region and its evolvement with time is studied.<br />
For simplicity no units are considered. <br />
Following boundary conditions are imposed on the edges of rectangle:<br />
1. Zero flux at boundaries.<br />
2. Dirichlet boundary condition.<br />
<br /><img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/Hz-fCMqdess" height="1" width="1" alt=""/>Tue, 24 Mar 2015 19:04:17 +00003.1427223857.311http://www.comsol.com/community/exchange/311/The cup is leaking model
http://feedproxy.google.com/~r/ComsolExchange/~3/AdrtyFPqAQY/
The cup is leaking model,It is very interesting.<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/AdrtyFPqAQY" height="1" width="1" alt=""/>Fri, 06 Mar 2015 18:41:54 +00003.1425667314.301http://www.comsol.com/community/exchange/301/Two axis Gimbal
http://feedproxy.google.com/~r/ComsolExchange/~3/MbBVT-Vn8Z0/
A two axis pendulum using a gimbal mechanism, rigid domains.<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/MbBVT-Vn8Z0" height="1" width="1" alt=""/>Thu, 19 Feb 2015 19:49:21 +00003.1424375361.291http://www.comsol.com/community/exchange/291/Influence of vessels on electroporation-based treatments of tumors
http://feedproxy.google.com/~r/ComsolExchange/~3/Nq-JE5MtcCE/
Electroporation-based treatments rely on increasing the permeability of the cell membrane by high voltage electric pulses applied to tissue via electrodes. To ensure that the whole tumor is covered with sufficiently high electric field, accurate numerical models are built based on individual patient anatomy and taking into account electrical properties of different tissues.<br />
We have designed a series of simplified models in order to establish the effect of presence of blood vessels in tumor vicinity on the electric field distribution and subsequently the coverage of the tumor with a sufficiently high electric field. Each of these models includes a simple sphere and cylinders geometry that represent a tumor, vessel, and needle electrodes. Different scenarios can be observed by varying tumor size, vessel size, distance between vessel and tumor, electrode configurations (with or without a central electrode) and the position of the vessel relative to electrodes: perpendicular or parallel.<br />
The model files included here are the two basic models from which all other variations can be generated. First model, "ECT4H10" is a model of an electrochemotherapy treatment of a 10 mm diameter tumor with 4 electrodes around the tumor and a vessel perpendicular to the electrodes. Second model, "ECT5V30" is a model of an electrochemotherapy treatment of a 30 mm diameter tumor with 4 electrodes around the tumor and 1 central electrode and a vessel parallel with the electrodes.<br />
NOTE: In order to keep the model files small the models include only one instance of study. The full model requires adding more studies of the same kind so that each study is solved for exactly one physics while others are set to inactive.<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/Nq-JE5MtcCE" height="1" width="1" alt=""/>Thu, 22 Jan 2015 17:34:04 +00003.1421948044.261http://www.comsol.com/community/exchange/261/3D fiber coupler
http://feedproxy.google.com/~r/ComsolExchange/~3/SrY201Eo9Y8/
Optical fiber coupler, based on the tutorial "Directional Coupler" using the Wave Optics module.<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/SrY201Eo9Y8" height="1" width="1" alt=""/>Thu, 18 Dec 2014 17:18:21 +00003.1418923101.251http://www.comsol.com/community/exchange/251/Plasmaline & Plasmaline-NG (microwave SWP and MVP)
http://feedproxy.google.com/~r/ComsolExchange/~3/hyat4I5264A/
* 2Daxisym-plasm... is a model of the so-called Plasmaline (E. Raeuchle, http://jp4.journaldephysique.org/articles/jp4/pdf/1998/07/jp4199808PR708.pdf)<br />
it is running a 70 Pa Argon at 500W and 2,45GHz but only on a single side input.<br />
* finger-upload is the single sided version.<br />
* basic-mwp-lineNG is the a version of the plasmaline invented here in Nagoya (MVP here, or Plasmaline NextGeneration for me) which omits the quartz tube but therefore need a DC-sheath space. (it shows the expected behaviour but the chemistry has no metastables)<br />
*MVP17 is my last model. It is converging within 1hr.40minutes with mesh2, you can find out steady-state by monitoring the Timeplot. It needs the right mobility values to get closer to reality and the sputtering effects.(may be not always converging.. sometimes the ion concentration makes problems if not some runaway of e-temperature)<br />
<br />
The models do not reproduce reality. Depending on which rate constant description I rely on, the power loss structure is very different (xsec-tables or townsend look-up). <br />
I need help on setting the right chemistry and mobilities..<br />
What is also missing is the sputtering effects of the DC voltage.<br />
The plasma color is definitively not the color of a pure Argon plasma but a lot of metal ions are present (10E15 to my extrapolation).<br />
<br />
need to solve the BE for giving the models the right mobility coefficients..<br />
looking for co-authors for a journal paper.<br />
<br />
one big open question is still the resonance effects of the electric field at the cutoff plasma density . I included the doppler broadening parameter used for the ECR case (an erf function on Efield value), but I have no plan how to calibrate it.<br />
<br />
what is a good value for secondary emission coefficient of Cu cathode material?<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/hyat4I5264A" height="1" width="1" alt=""/>Fri, 24 Oct 2014 07:11:58 +00003.1414134718.213http://www.comsol.com/community/exchange/213/Computation of Antenna Radiating Near-Fields
http://feedproxy.google.com/~r/ComsolExchange/~3/K4XT-hR9UQI/
Calculation of radiating near-fields from aperture antennas, if obtained via brute-force 3D FE-based methods, is very computationally intensive. A better way is to limit the FE computation space to only a modest volume surrounding the antenna, and then use the computed fields therein to predict the radiated fields elsewhere. This short and informal note describes one way to do that, i.e., to compute Radiating Near-Fields within the Comsol RF module (in the frequency-domain formalism) using a near-field version of the Stratton-Chu Aperture Field Integration approximation method. This method effectively fills in the gap between Comsol's FE-based (but very-local) field computations and Comsol's included tool for computation of far-field patterns.<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/K4XT-hR9UQI" height="1" width="1" alt=""/>Thu, 18 Sep 2014 03:44:48 +00003.1411011888.247http://www.comsol.com/community/exchange/247/Initial stress
http://feedproxy.google.com/~r/ComsolExchange/~3/hBCWmhNL0A4/
alternative solution <br />
The equilibrium theory of in situ stresses<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/hBCWmhNL0A4" height="1" width="1" alt=""/>Tue, 05 Aug 2014 08:25:16 +00003.1407227116.243http://www.comsol.com/community/exchange/243/Magnetic Gear
http://feedproxy.google.com/~r/ComsolExchange/~3/DttLL-rUZts/
Additional materials for webinar -> http://www.comsol.com/events/2057/Modeliruem-v-COMSOL-Multiphysics<br />
<br />
Webinar created with support COMSOL Russian User Group -> http://vk.com/comsolmultiphysics<br /><img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/DttLL-rUZts" height="1" width="1" alt=""/>Fri, 13 Jun 2014 09:36:58 +00003.1402652218.241http://www.comsol.com/community/exchange/241/Deformation of free surface under pressure– 2D model with surface tension
http://feedproxy.google.com/~r/ComsolExchange/~3/gOQbN4vOoXA/
This model is concerned with the simulation of incompressible Newtonian fluid flow problems with surface tension. The fluid is initially at rest in a square tank. A Gaussian pressure is applied on the free surface which deformed the initially flat surface. This model is developed for a 2D transient analysis. The movement and deformation of the computational domain are accounted for by employing the Arbitrary Lagrangian-Eulerian (ALE) description of the fluid kinematics. The implementation of the model is detailled step by step in the pdf file for the version 3.5a.<br />
To visualize the results, you need to solve the comsol file.<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/gOQbN4vOoXA" height="1" width="1" alt=""/>Tue, 27 May 2014 12:09:29 +00003.1401192569.118http://www.comsol.com/community/exchange/118/Square drop oscillation under surface tension – 2D axi-symmetric model
http://feedproxy.google.com/~r/ComsolExchange/~3/XD4K52f1iRs/
This model is concerned with the simulation of incompressible Newtonian fluid flow problems with surface tension. An initially cubic drop of water is oscillating under surface tension forces. This model is developed for a 2D axi-symmetric transient analysis. The movement and deformation of the computational domain are accounted for by employing the Arbitrary Lagrangian-Eulerian (ALE) description of the fluid kinematics. <br />
The implementation of the model is detailled step by step in the pdf file fir the version 3.5a. To visualize the solution, you need to solve the model.<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/XD4K52f1iRs" height="1" width="1" alt=""/>Tue, 27 May 2014 11:35:30 +00003.1401190530.121http://www.comsol.com/community/exchange/121/Elastic Relaxation of Pre-stressed Bilayer
http://feedproxy.google.com/~r/ComsolExchange/~3/wFneyJhwcU0/
In recent decade, the principle of bimetal bending was exploited in the field of thin films. Rolled-up micro- to nanotubes with multiple windings were obtained with this technology as well as wrinkled nanostructures. The competition of these two morphologies is studied by simulation of elastic relaxation with the help of Structural Mechanics Module. The structure consists of first layer compressed initially and second layer without initial strain. If the difference of the initial strains of the layers is sufficiently large, bending into the tube is preferred, otherwise wrinkling is observed. For medium strain gradient, intermixing shape of tube with wrinkles is the result of elastic relaxation. Additional information and qualitative experimental comparison can be found in article P. Cendula et al, submitted (2013).<img src="http://feeds.feedburner.com/~r/ComsolExchange/~4/wFneyJhwcU0" height="1" width="1" alt=""/>Tue, 15 Oct 2013 11:43:53 +00003.1381837433.232http://www.comsol.com/community/exchange/232/