Derivative over double summation?

Please, can someone help me find the derivatives in this attachment? You can solve it in the attached word document. Thank you so much.

31 December 2018 1,038 0 View

Obtain element-wise strain energy in Comsol?

I am linking Comsol with Matlab. I can compute the strain energy density on the nodes of the finite element (Ws) and the unit is J/m^3. But I need the strain energy on each element of the finite...

31 December 2018 9,143 1 View

Implementing signed-distance function code directly inside Comsol?

Good day, Please, I need help: I have this signed-distance function code and I need to implement it directly inside Comsol (please, note that I do not want to couple Comsol with Matlab), but I...

06 July 2018 6,917 0 View

Please, how I can set up level set in Comsol multiphysics which can be used for solving three dimensional problem?

Please, how I can set up level set in Comsol multiphysics which can be used for solving three dimensional problem? Thank you so much.

06 July 2018 505 4 View

How can I vary the topography of a model in comsol?

I have a 3D model in comsol (Please, find the attached comsol model). I want to get the x, y and z coordinates of the model. And I want to use the z coordinate as design variable. the ultimate...

09 October 2017 3,689 1 View

Implement topography optimization and bead optimization to improve structural stiffness in Comsol

Please, I need help on how to implement topography optimization and bead optimization to improve structural stiffness of engineering component in Comsol. Thank you.

07 August 2017 8,156 0 View

How can I output global displacement in Comsol?

06 July 2017 9,492 4 View

Output area and perimeter of geometry from Comsol in Matlab workspace

I am using COMSOL Multiphysics 5.2a with MATLAB. Please find the attached MATLAB code generated from COMSOL. I already have the codes to generate the perimeter and the area of the...

06 July 2017 4,397 1 View

How can I create a geometry in Matlab and issue a command from matlab to patran to mesh it?

04 May 2017 4,701 4 View

Obtain Displacements, Stresses and Stiffness matrix for each Abaqus input files called from Matlab command window

04 May 2017 4,848 3 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View