How do I select an appropriate optimization tool?

I am performing a CFD study in "Ansys Fluent" where some 5-10 parameters are to be optimized. I can see a list of optimization tools provided by Ansys Workbench as integrated tools. How do i...

06 July 2018 751 5 View

What is the meaning of "centre-line pressure distribution"?

While reading a textbook, i saw this term in the following context, which is related to vehicle aerodynamics. The centre-line pressure distribution arising from the airflow over a typical...

05 June 2018 5,510 0 View

How to reduce friction/viscous drag?

From the texts on vehicle aerodynamics, i have learned that a better shape of a car can reduce the pressure drag involved. What can be done to reduce the viscous drag?

05 June 2018 1,670 5 View

What is "Cell Active Area" in a PEMFC?

In the literature, most of the authors mentions the active area of the fuel cell being investigated. Is the area bounded with the red box (see attached image) the effective/active area of a PEMFC...

11 December 2017 9,277 0 View

How to calculate the drag coefficient from a 2D geometry

05 June 2017 3,155 7 View

Can a PEM fuel cell give it's maximum power at 3V?

Usually, researchers draw an IV curve to study the performance of a pemfc. I have two questions in that. Is that only to find the peak power (I x V) point to operate the cell at the particular...

07 August 2016 533 2 View

In a 100% humidified hydrogen, what would be the mass of water molecules per unit mass of hydrogen?

My CFD simulation requires a humidified (mixed species H2 & H2O) hydrogen supply at a boundary in which the mass flow (without humidification) of hydrogen to be supplied is predetermined. I...

04 May 2016 4,736 5 View

What are the suitable inlet and outlet boundary conditions for a recirculating anode type PEMFC?

I am trying to simulate a single cell recirculating anode (open end anode) PEMFC using Ansys Fluent Fuel cell module. It is recommended by Ansys to keep "mass-flow inlet" for anode & cathode...

03 April 2016 6,344 3 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

Arena simulation - how do i model the following model in ARENA (see description) (new to ARENA)?

Hello, I'm fairly new to ARENA and I have the following problem: I have two queues in which, in each queue, a different order type arrives (both having an arrival rate of exponential 10). Order...

02 March 2021 2,431 3 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

Why the results when using wall thickness and when using shell conduction are different in ansys fluent?

Actually, I am running cfd simulation for a heat exchanger which has two fluids one hot and other one is cold fluid. there is a solid domain between them, which I removed and instead I have used...

01 March 2021 9,537 2 View

Joint behaviour in Abaqus is not captured well?

I am working on roof joint and trying to simulate the behaviour in Abaqus. I am successful in running the model but the final graph does not follow the experimental curve in the negative direction...

01 March 2021 6,661 3 View

How much pressure we can reduce at the outlet to avoid Reverse Flow?

I am simulating Heat Exchanger. I have tried and tested all the methods to resolve this issue from the internet like refining mesh, improving skewness and orthogonal quality ,extending outlet to...

01 March 2021 6,985 3 View

In Molecular Dynamics Simulation, how do I make changes to the force field according to my protein?

Hi In Molecular Dynamics Simulation, how do I make changes to the force field according to my protein? I got this error in the add-ion stage: Fatal error "./ amber99sb-ildn-HHH.ff / force...

01 March 2021 8,747 4 View