# How much do I numerical dissipation?

 Register Blogs Members List Search Today's Posts Mark Forums Read

 February 23, 2004, 01:02 How much do I numerical dissipation? #1 QU KUN Guest   Posts: n/a I'm studying a kind of particle method in which viscosity can be controled quantificationally. I'm trying to solve shockwave case with it. Because of the dicontinuity, some numerical disipation is needed. I tried to add an additional viscosity term. But I don't know how to define the viscosity coeeficient of the numerical disipation.

 February 23, 2004, 02:30 Re: How much do I numerical dissipation? #2 Apurva Guest   Posts: n/a which scheme r u using

 February 23, 2004, 04:46 Re: How much do I numerical dissipation? #3 QU KUN Guest   Posts: n/a The scheme is not of FDM/FVM/FEM. It is a kind of lattice boltzmann scheme in which viscosity can be controlled by a parameter Tao. At every node, the viscosity nu is a function of pressure P and collision time Tao. If the viscosity is known, I can get Tao according to P. Now I don't know how to estimate the best viscosity nu. If nu is too small, Tao will be too small and the solver will diverge. If it is too large, Tao will be too large and the result will be absurd.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Flo Main CFD Forum 6 January 25, 2008 13:35 Márcio Ricardo Main CFD Forum 15 November 9, 2005 21:15 zwdi FLUENT 2 June 3, 2004 21:09 Praveen Main CFD Forum 0 September 6, 2002 07:09 sam Main CFD Forum 0 June 22, 2002 19:14

All times are GMT -4. The time now is 16:55.