Gas sensor response and recovery time independant of flow rate and chamber volume?

I am trying to obtain the response and recovery times for my gas sensor device. It appears the the response/recovery times are primarily dependant on the flow rate of the gas I inject into the...

26 February 2021 1,511 3 View

Cracked MEMS cantilevers despite wet release and critical point drying?

I have successfully released MEMS cantilevers with a photoresist sacrificial layer, using a dry plasma ashing technique. However, this process tends to damage the metal contact pads and result in...

15 November 2020 8,963 6 View

Hello Everyone, I am trying to regress a numeric variable on all categorical variables, which method would be the most suitable, ANOVA,Linear Regrsn?

I tried running Linear Regression but I feel the model has heteroskedasticity.

03 May 2020 6,874 6 View

Which method is precise and reproducible to determine concentration of 0.5% w/w Glutaraldehyde; Titrimetry or GC ? Describe the method in brief?

Glutaraldehyde, in low concentration at buffered pH 7.2, is used as a shipping solvent for Medical devices involving animal tissue. Suggest a accurate and reproducible method for determining assay...

12 March 2020 6,032 1 View

When to use bounded Second Order Implicit Time Integration in Fluent?

Fluent offers different temporal discretization schemes. There are two implicit schemes: Second order and bounded second order. I am wondering what are the advantages and disadvantages of these...

12 December 2019 3,795 4 View

How to implement Distributed Activation Energy Model (DAEM) in ANSYS Fluent?

I want to model a chemical reaction in Fluent. However, reaction being too complicated, there is no single activation energy model available. The DAEM approach is used to estimate the products...

26 August 2019 7,144 1 View

How to model a chemical reaction in Fluent involving gaseous reactants and solid product?

I am currently simulating a system involving various chemical reactions. My primary phase is gaseous and secondary phase is solid. There are reactions involving solid to solid and gas to gas...

02 May 2019 3,826 3 View

Can I use k-epsilon turbulence model for transitional flow?

I have a geometry where the flow is transitional. i.e. a part of it has laminar flow and rest part has turbulent flow. Can I use k-epsilon model for this problem? Does it resolve the laminar...

28 March 2019 6,428 19 View

How to get the diameters of droplets in Fluent?

I am simulating a diesel spray in air. I want to get the number of droplets and their diameters (preferably individual over mean) at certain time step. How can I extract this data?

13 December 2018 8,433 3 View

What are the advantages of Finite volume method (FVM) over Finite difference Method (FDM) for particularly flow simulation (CFD) ?

Most of the CFD solvers use FVM. However, FDM is pretty simple to implement. I am interested to know exactly what advantages do FVM offer. And when should one go for FDM if he is planning to write...

13 December 2018 8,641 38 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