How to integrate the time dependent function?

More Bacha Munir's questions See All

How to solve the ode with maximum accuracy?

Dear friends, I am interested in the solution of the following ODE with maximum accuracy using Euler method. dy/dt =Ay where A=[1; 0; 4], is a 3-by-1 matrix. Thank you....

10 November 2019 2,239 2 View

How to apply moving mesh capability in COMSOL?

Dear friends, In the attached MPH file, I am simulating a gas bubble moving in fluid using COMSOL moving mesh application. The COMSOL weak form pdes application mode was applied but...

10 November 2019 528 4 View

Dose it is good to publish papers in MDPI journals?

Hi friends, If we publish all papers in MDPI SCI journals during PhD studies, is it good?. Can it create some problems in future post doc apply or to apply some jobs?. What are your...

10 November 2019 3,727 4 View

How to write surface gradient operator in COMSOL?

Hi friends, Dels is a surface gradient operator which we applying to find the tangential velocity along a surface/arc. It can be written as...

08 September 2019 9,096 3 View

How to set the line width in COMSOL/MATLAB live link simulations?

Dear friends, I a have a problem in setting the line width of a graph in COMSOL/MATLAB live link simulations. Using the command mphplot(model,'pg1', 'LineWidth', 2) dose not work. How I can set...

08 September 2019 1,970 4 View

How to create a three-dimensional droplet geometry in COMSOL?

Hi friends, I need to create a 3D geometry of bubble/droplet in a channel using COMSOL. Please, can anyone upload an mph file for such a geometry or can guide me?. I shall be very thankful.

05 June 2019 3,945 7 View

How to make a geometry for moving bubble?

Hello everyone, I am looking for a geometry construction in COMSOL, when a small elliptical shape bubble moving in fluid in cylindrical channel using ALE (method) with appropriate meshing. Can...

03 April 2019 2,198 3 View

What is Naiver Slip boundary condition?

Hi all, I am simulating moving mesh in COMSOL where I need to apply Naveir-slip boundary condition (found in literature). I do not know its role in moving mesh free surface (air-liquid) flow....

02 March 2019 1,900 4 View

How to simulate bubble motion?

Hi, I am using Comsol to simulate a bubble moving in blood vessel. In my simulation i am applying moving mesh (ale) application mode. Comsol solves equations, but the bubble can not move as...

01 February 2019 5,354 7 View

How to simulate microbubbles?

Hi, I am studying micro bubbles flow in lungs for mechanical ventilation. But due to less information about bubble simulation, I cannot. Dose, anyone have some mph files which can support my...

01 February 2019 2,703 3 View

Is there any tutorial for comsol general projections?

Hi, im trying to make a projection in a 3d comsol model. I have a non uniforme chanel and my intention is to get the average tempreture in the y-z cross section and se the average tempreture...

02 March 2021 4,624 4 View

Is it possible to do piezoelectric coupling in ANSYS-APDL or COMSOL between tapered substrate and rectangular piezoelectric patch?

How to do Piezoelectric coupling in ANSYS-APDL or COMSOL between tapered substrate and rectangular piezoelectric patch? Piezoelectric coupling between the rectangular substrate and rectangular...

02 March 2021 9,833 3 View

Energy minimization in LAMMPS using NVT ?

How do I do energy minimization in lammps with NVT ensemble ? I am using the following command and it does not seem to work. It stops at extremely high energy and gives me the error zero search...

01 March 2021 2,294 3 View

Why is the sum of the elements in a row in a Q matrix equal to zero?

When explaining substitution models, the substitutions are expressed as Q matrix. Why is the sum of the elements in a row zero?

28 February 2021 3,864 3 View

How can i resolve the "final solutuin is not converged" error in Comsol for my heat transfer simulation??

I have been trying to simulate heat transfer problem in Comsol 5.5 for long time but it always throw an error stating: "Failed to find a solution. Maximum number of Newton iterations...

28 February 2021 8,626 3 View

How to use measure capacitance change in COMSOL time dependent study ?

I want to measure change of capacitance due to relative displacement between two parallel plates in COMSOL. Distance between two plates changes with time. So I'm using a time dependent study but...

26 February 2021 8,567 3 View

Error in comsol?

Dear respected researchers, while performing CFD analysis in Comsol it's showing like this Error: Nonlinear solver did not converge. The maximum number of Newton iterations reached can...

24 February 2021 249 3 View

What software programs can directly simulate Additive Manufacturing Directed Energy Deposition (DED)?

I understand there are a lot of software programs that can simulate DED by going through specific modeling, simulation, and commands. For me, that was time consuming and results were not accurate....

24 February 2021 4,428 3 View

How can I find the effect of different parameters like (Reynolds number, Hartman number, volume friction etc.) in COMSOL?

Here I am facing this problem. I don't find any effect of this type of parameters. I am a beginner user of COMSOL.

23 February 2021 9,086 3 View

Why the CHi^2 is close to zero with a bad fitting but the Rp and Rwp are still high?

I am refining my XRD data using in FullProf program. The intensity of the modulated X-ray peaks is almost flat. I tried to adjust the peak intensities but unsuccessful. What is the reason? I guess...

23 February 2021 2,304 4 View

Antoni Artinov

Hi Bacha,

I would check Definition -> Component Coupling -> Integration. But as fas as I know, with this predefined operator you will be able to integrate only over the domain, a boundry, an edge or a point. Good luck!

Best regards,

Bacha Munir

Thanks all for your replies. Please, @Riccardo Rossi, can you write the syntax how to write in COMSOL parameter window. I want to use this value of integration in model equations.

How to give the integration limits there. AS timeint use in results processing and intop1 also cannot integrate it.