Can we use methane-air chemical mechanism, which includes H2 oxidation mechanism as a submechanism, for a H2 combustion simulation with CFD?

Can we use methane-air chemical mechanism, which includes H2 oxidation mechanism as a submechanism, for a pure H2 combustion simulation or H2 enriched methane combustion simulation with CFD? Do...

10 November 2018 6,394 17 View

Is the reaction rate constant, k(T), of a chemical reaction affected by the kind of a third inert species, under the constant temperature condition?

Is the reaction rate constant, k(T), of a molecular chemical reaction affected by the kind of a third inert species (CO2 or N2 for example) under the constant temperature condition ? The reaction...

10 November 2018 1,726 19 View

Why does the mixture fraction combustion model overpredicts the outlet temperature in a natural gas boiler, according to the experimental datas?

I am simulating natural gas combustion in ANSYS Fluent. If i use the mixture fraction combustion model, the outlet temperature of the boiler is overpredicted according to the experimental datas....

06 July 2018 2,618 4 View

I am simulating methane - air combustion on Ansys Fluent. I use DO radiation model. Radiation residual diverges?

I am simulating methane - air combustion on Ansys Fluent. I use DO radiation model. For the first 700 iterations, the solution continuously converges. But later, the radiation residual suddenly...

31 December 2017 6,869 6 View

I am simulating methane - air combustion on Ansys Fluent. I use DO radiation model. I got all the residuals converged except radiation residual?

I am simulating methane - air combustion on Ansys Fluent. I use DO radiation model. I got all the residuals converged except radiation residual. The results look reasonable. The total heat...

11 December 2017 3,685 3 View

I am looking for a skeletal methane combustion mechanism in chemkin format, which has 17 species and 25 reactions. Where can i get it?

I am looking for a skeletal methane combustion mechanism in chemkin format, which has 17 species and 25 reactions. I have searched through many web sites but i can't get it. It is propably called...

10 November 2017 5,060 7 View

On your experience, what is the most preferable radiation heat transfer model for a combusting medium in Ansys Fluent?

On your experience, what is the most preferable radiation heat transfer model for a combusting medium (e.g. natural gas-air) in Ansys Fluent?

10 November 2017 2,888 3 View

Solution is converged for my cold flow analysis (methane-air) on Fluent, but the results look nonphysical ?

I'm simulating a cold flow analysis (methane-air) on fluent, using species transport model. The model has around 5 millions meshes with tetrahedrons and swept bodies. I use "realizable k-epsilon"...

08 September 2017 7,693 6 View

What is the difference between thermodiffusion coefficient DT and thermodiffusion coefficient for a particular species DT,i?

10 November 2016 3,142 0 View

What is the definition of the global reaction and semi-global reaction?

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07 August 2016 3,416 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 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

Resistor definition in Piezoelectric bimorph with ANSYS workbench

Hello, good day! I am trying to simulate similar bimorph piezoelectric harvester with below commands. However, the output power doesn't change with resistor value. Please help to find the reason. ET,10,CIRCU94,0 !SET UP RESISTOR R,1,100000 !RESISTANCE VALUE TYPE,10 !SET ELEMENT TYPE E,1,2 !CREATE RESISTOR BETWEEN NODES 1 AND 2 Thanks in advance Regards,

02 March 2021 0 0 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

What is the characteristic length to determine the Reynolds number for the scattered turbulent fluid flow?

Dear all, I just saw this example in FB on the difference between laminar flow and turbulent flow. The flow from a pipe hits the sink and scattered. The flow from the pipe is characterized as...

02 March 2021 1,999 5 View

Can we distinguish the type of free fluid inside the pelvic and abdominal cavities whether blood or serous fluid using the ultrasound?

during ultrasound examination of acute abdomen, sometimes we see free fluid , can we know the type of fluid ,whether blood or not , using ultrasound only? if yes , what are the sonographic...

01 March 2021 7,476 4 View