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Search took 0.00 seconds. Search: Posts Made By: Jan Smedseng
Forum: Main CFD Forum July 17, 2016, 16:43
Replies: 18
Views: 1,136
Posted By Jan Smedseng
Thanks. I do not have starccm but I got fluent....

Thanks. I do not have starccm but I got fluent. There, I cannot have a look on the corrections. In fluent, the flow looks great after the first iteration, also using simple algorithm.
Forum: Main CFD Forum July 17, 2016, 16:42
Replies: 18
Views: 1,136
Posted By Jan Smedseng
I'm simulating a steady state flow without...

I'm simulating a steady state flow without transient terms. What do you mean with being careful with the boundary conditions for the pressure gradient? For the gradient calculation, I use:
- Zero...
Forum: Main CFD Forum July 17, 2016, 16:11
Replies: 18
Views: 1,136
Posted By Jan Smedseng
Yes, you're right. I'll try that and write later....

Yes, you're right. I'll try that and write later.

But shouldn't the solver be able, to converge with zero initialisation? Because, if I have a U-pipe, this initialisation will be very wrong...
Forum: Main CFD Forum July 17, 2016, 16:02
Replies: 18
Views: 1,136
Posted By Jan Smedseng
Because this initial source is based on the...

Because this initial source is based on the massflow on the inlet - and on the inlet, the massflow is defined by the area of the face and the inlet velocity. If a cell inside the domain is much...
Forum: Main CFD Forum July 17, 2016, 15:56
Replies: 18
Views: 1,136
Posted By Jan Smedseng
But that can become very wrong, if I use...

But that can become very wrong, if I use unstructural grids with large volume rations, doesn't it?
Forum: Main CFD Forum July 17, 2016, 15:50
Replies: 18
Views: 1,136
Posted By Jan Smedseng
Sure, it is not correct - but I have to define...

Sure, it is not correct - but I have to define something for the first iteration. But at the inlet, my solver is working I think. At the outlet, I get very high and unphysical results after some...
Forum: Main CFD Forum July 17, 2016, 15:10
Replies: 18
Views: 1,136
Posted By Jan Smedseng
I'm initializing with zero - so the initial flow...

I'm initializing with zero - so the initial flow field with the boundary conditions leads to a non divergence-free flow. In the first iteration, the pressure is zero everywhere. So the Massflow on...
Forum: Main CFD Forum July 17, 2016, 14:21
Replies: 18
Views: 1,136
Posted By Jan Smedseng
Ok, thank you. But I got one more question. After...

Ok, thank you. But I got one more question. After the first iteration solving the momentum equation, I got a massflow of 0 kg/s on every outlet face, because the flow has not reached the outlet after...
Forum: Main CFD Forum July 17, 2016, 08:06
Replies: 18
Views: 1,136
Posted By Jan Smedseng
Scaling outlet massflow for incompressible flow

For incompressible flow, I have to scale the outlet massflow to achieve global mass bilance every iteration. Do I have to scale the massflow only for the pressure-correction equation or also for the...
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