How can I automatically extract normalized Eigen function in COMSOL?

12 December 2014 1 3K Report

I have noticed that COMSOL does not give me normalized eigenvalue when I tried to solve 1D/Mathematics/Coefficient Form PDE/Eigenvalue.

should I manually normalize the Eigenfunction?

How can I do that?

Vahid Mosallanejad

I got the answer. With the following steps, the normalized Eigen function can be achieved:

1- Define the integration operator ("intop1") from: Model/Definitions/Model Coupling and select whole domain

2- Define a variable like u_nor=u/(sqrt(intop1(u^2)))

3- From Result/Derived values/Gobal Evaluation put intop1(u_nor^2) to make sure that for each Eigen values the result is 1

Badges
Science topic

More Vahid Mosallanejad's questions See All

What is the origin for terms G(n/Nc) and G(p/Nv) in equations of COMSOL Semiconductor Module?

Please check the attachment.

10 November 2018 9,819 0 View

How can I join a "Stationary" and a "Eigenvalue" study in one COMSOL study?

I first need to perform a "Stationary" study ( first step) and then "Eigenvalue" study as the second step in a COMSOL model. The Eigenvalue PDE will feed by the results of "Stationary" study. I...

02 March 2016 8,993 1 View

How to plot a 2D variable with several optimized parameters at the end of 2D Curve Fitting Optimization in COMSOL?

There is one example which clearly shows, who it is possible to optimized parameters in order to fit 1D experimental data to a 1D function in COMSOL. At the end ,"Global" node has been used to...

01 February 2016 5,254 0 View

How to change the default Eigenvalue name “lambda” for an individual “Study” in COMSOL Multiphysics?

To prevent conflict between two similar Eigenvalue “studies” I need to change the Default name of Eigenvalue from “lambda” to let’s say, “lambda2”? How can I change it? I would be appreciate of...

11 December 2015 2,595 2 View

How can the results of two separated (Eigenvalue) studies be imported in third (Stationary) study in COMSOL?

The results of first study can be imported in second study by adjusting the solution setting “Values of Dependent Variable” –“Values of Variables Not Solved for”. However, it is unclear How to...

11 December 2015 9,666 1 View

How to merge the results of a "Parametric sweep" applied to a 2D model to make 3D data in COMSOL?

Imagine, there are series of 2D results which must be complete using "parametric sweep" (e.g. set of {S(y, z)}, each " S" for one point in x direction). This means "Parametric sweep" has been done...

10 November 2015 1,886 1 View

How can I improve the quality of step like, position dependent variable in COMSOL?

It is possible to define a position dependent variable in COMSOL by some sort of logical conditional expression, like: 8*(y10). However, in practical 2D example, there is some...

10 November 2015 7,668 3 View

How do I import 2D data (cross section) resulted from first solution(3D) to the second 2D physics as a position dependent variable in COMSOL?

I am very thankful if anybody give me a suggestion. It is well described who to build 2D Geometry from 3D in COMSOL. Imagine, a cross section of first result (Lets call the first results as...

09 October 2015 4,325 6 View

Why the imported 3D variable through the “interpolation” does not imported correctly in COMSOL?

Imagine you have two 3D PDE to solve by COMSOL. The answer of first one will later replace as position dependent variable in second physics. There is two option. One way to do that is to export...

04 May 2015 8,318 4 View

Can someone show me a simple theoretical explanation to understand shifting of Fermi level on semiconductor due to applying vertical electric field?

Vertical electric field is using to tune the electrical properties of channel in FETs. In new 2D material this is referred to the shifting of electrochemical potential. In contrast in simple...

03 April 2015 5,344 5 View

Problems about acousto-optic coupling in Comsol, how to check whether the moving mesh is correct?

I’m trying to reproduce the acousto-optic coupling simulation in the paper Frequency–angular resolving LiDAR using chip-scale acousto-optic beam steering. LNOI(lithium niobate on insulator) is...

13 August 2024 9,795 0 View

What is the difference between mathematical R^4 space and physical 4D unit space?

We assume that the difference is huge and that it is not possible to compare the two spaces. The R^4 mathematical space considers time as an external controller and the space itself is immobile in...

10 August 2024 6,678 14 View

Which Scopus Journal provides the most affordable fees?

"PUBLISHING IN A SCOPUS JOURNAL" Researchers are now at a cross road. The critical need to publish in a Scopus or ISI, etc journal is ever vital. Journal Publication fees must be submitted....

10 August 2024 8,621 1 View

Seeking Advice on Viability and Execution of Undergraduate Thesis Topic?

Hello everyone, I am currently developing a thesis proposal and would appreciate your input on its viability and how to effectively carry it out. My proposed topic is: "Does the perceived threat...

10 August 2024 8,992 0 View

Who will be moral responsible for the death of thousands of people in the event of an earthquake?

Who will bear moral responsibility for the deaths of thousands of people in the event of an earthquake? Weeks and months remain before the onset of strong earthquakes that bring death to...

08 August 2024 6,134 12 View

Are there any instruments for studying time similar to the way it is in space?

There are a huge number of methods for studying objects in space, according to the senses (and not only). Mechanical, thermal, optical, acoustic, electrical, magnetic, based on particle beams,...

06 August 2024 7,102 0 View

In the case of a wound l recurrence after radical breast cancer and sentinel lymph node biopsy. Are the sentinel lymph node procedure recommended?

In the case of a wound l recurrence after radical breast cancer and sentinel lymph node biopsy. Are the sentinel lymph node procedure recommended? If no axillary lymph node dissection was not...

05 August 2024 8,056 1 View

Regarding a model for simulating battery charge and discharge, what do you consider to be high fidelity?

Regarding a model for simulating battery charge and discharge, what do you consider to be high fidelity? What is the acceptable percentage of error (regardless of the metric)? Could you suggest...

03 August 2024 5,358 0 View

Interested in a SCOPUS collaboration?

Hi RG family. My team and I are working on some SCOPUS publications and we need co-authors who are willing and capable of undertaking both qualitative and quantitative-based studies. The scope...

02 August 2024 7,843 0 View

Interested in a SCOPUS collaboration?

Hi RG family. My team and I are working on some SCOPUS publications and we need co-authors who are willing and capable of undertaking both qualitative and quantitative-based studies. The scope of...

02 August 2024 8,572 0 View