How to vary thickness of surface unevenly in comsol geometry?

I have a tube with a fixed inside thickness. Now, I want to change thickness of some part of this tube to X mm and some part to Y mm. Rest of the part has no change. Moreover, the parts of...

02 March 2019 7,711 3 View

Are oscillations in COMSOL Water-Hammer example die down with respect to time ?

I recently saw an example of water-hammering effect example of COMSOL Multiphysics. The example shows that the sudden closing of a valve produces pressure-shock through out the pipe upstream to...

31 December 2018 1,411 3 View

Shell and tube heat exchanger in comsol is not converging ?

I'm simulating a shell and tube heat exchanger in comsol . I am plugging some of the tubes within the structure to see its effect on del.P and temperature. When I plug 18 of 19 tubes, and one...

09 October 2018 9,825 4 View

Wall lift off in CFD ?

Dear all, I want to know about the wall lift off in CFD simulations What's it's significance and why they are different in FEM and FVM? Moreover, if it only depends on meaning, then why in...

08 September 2018 4,778 0 View

Related to the MATLAB-Livelink functionality ?

I have a doubt: A : 1. If a parameter value (say 'x = 100 ') is changed in model via Matlab-Livelink (via Matlab coding) 2. model is run. After it, B : 1. Again the paramater value is changed...

07 August 2018 6,347 0 View

CFD and Aspen Plus Validation of Heat Exchanger ?

I have simulated a heat-exchanger in COMSOL. The same heat-exchanger is simulated (with the exact geometry ) in Aspen Plus. I'm facing following problems in above: 1. The results of Aspen Plus...

06 July 2018 6,033 0 View

External material addition in COMSOL ?

Hello, I want to add an external material to the COMSOL for simulation. How can we do it? thanks.

04 May 2018 4,035 0 View

Using global variable in S-function ?

Dear all, I am trying to connect a function-file in MATLAB to Simulink via 2nd level S-function. But I have a global variable defined in my function file. Can anyone let me know, how to declare...

03 April 2018 1,345 3 View

Connecting COMSOL to Simulink ?

Dear all, I want to use the S-function in Simulink to connect it to COMSOL. I am able to use the Livelink and can import COMSOL model to MATLAB and can access the results. But my problem is as...

03 April 2018 9,674 1 View

Co-Simulating Aspen Plus / Hysys and CFD/COMSOL or FLUENT using CAPE-OPEN?

Dear all, I am trying to co-simulate a chemical process in two-different environment. One is Aspen Plus and another is an CFD based simulator. The process has different units to be simulated in...

02 March 2018 4,485 4 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

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

What is your perception on using visual analysis or quantitative approaches to evaluate data from single-case research designs (n of 1 trials)?

Results of single-case research designs (i.e., n-of-1 trials) are often evaluated by visually inspecting the time-series graph and computing quantitative indices. A question our research team is...

03 March 2021 687 1 View

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View